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Systems Analysis
International Institute for Applied Systems Analysis
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534
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452
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348
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Probability
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294
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42
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287
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293
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28
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263
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677
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99
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8
265
240
221
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Birth control
8
265
22
28
101
soil microbiology
5
258
60
82
101
Water quality management
4
258
105
46
103
Forest Ecology
3
256
44
30
104
Development Economics
2
252
95
27
105
Public Health
9
244
603
915
106
Recycling
7
241
8
33
107
Fishery resources
4
238
25
16
108
Group decision making
3
235
19
13
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Statistical physics
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228
264
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10
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30
56
111
Regional Planning
11
224
28
66
112
Economic Assistance
3
218
32
27
113
Nonlinear Dynamics
2
215
182
84
114
Water pollution
3
205
224
141
115
Transport
2
201
48
20
115
Sea
2
201
43
16
117
forest policy
7
190
6
5
118
Demography
13
185
25
55
119
Chemical Engineering
3
176
1723
1171
120
Biochemistry
3
174
5604
3565
120
Soil biology
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174
52
59
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Plant Ecology
6
168
372
638
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Energy Conversion
2
158
135
147
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4
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16
26
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Emergency Medical Services
5
151
18
19
126
Decision making
2
148
371
144
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Biomedical Engineering
8
146
262
585
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health planning
8
146
148
253
129
greenhouse effect
5
143
1
1
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Carbon
5
143
43
109
129
Carbon dioxide
5
143
1
1
129
Climate
5
143
17
34
133
irrigation
1
142
122
10
134
Humanities
5
137
91
65
135
Food preferences
1
136
143
34
136
Europe
5
135
266
263
137
Soil Science
2
132
333
212
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United Kingdom
4
132
150
199
137
Aging
11
132
138
407
140
Animal Behavior
2
129
385
298
140
Ethology
2
129
317
232
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Food Policy
3
127
31
38
142
agricultural policy
3
127
16
25
142
economic policy
9
127
156
221
142
Food
3
127
1034
1021
146
soil conservation
1
125
537
142
146
land degradation
1
125
494
131
146
Great Lakes
1
125
36
7
146
degradation
1
125
494
131
150
Natural resources
7
124
33
74
151
Econometrics
8
121
69
195
151
plant communities
5
121
314
680
153
Aquatic ecology
3
114
192
172
154
environmental indicators
3
113
47
71
155
Geriatrics
10
111
442
1522
156
Microbiology
2
108
2862
2566
157
Plant physiology
1
103
1364
878
157
Plant cells
1
103
1553
1401
159
Political Science
1
102
688
178
159
Public Choice
1
102
42
19
161
Geology
5
101
490
682
162
Geographic information systems
9
100
13
33
163
Religion and Sociology
1
98
19
1
164
Ecosystem management
1
97
75
48
165
Waste management
1
96
197
68
165
Water Purification
1
96
93
49
167
Labor Economics
4
95
17
37
168
Fertilizers
3
94
15
12
169
Geobiology
3
93
269
362
169
population geography
7
93
24
75
171
Systems Biology
1
90
400
225
171
Hydrometeorology
1
90
19
14
173
immigration
2
89
3
17
173
migration policy
2
89
8
18
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Asylum seeker
2
89
3
17
176
Rural Development
2
87
58
53
176
Mathematical Economics
3
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15
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176
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1
87
435
120
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5
86
13
24
180
Plant diseases
2
84
314
251
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Statistical Mechanics
1
81
112
34
182
Epidemiology
1
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2014
1247
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China
4
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329
384
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1
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1424
1268
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Conservation Biology
4
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230
670
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Remote Sensing
4
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54
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Simulation Methods
7
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21
124
188
Population Dynamics
4
75
4
6
189
Energy Consumption
3
74
4
8
190
Molecular Biology
2
72
9580
10841
190
Aquaculture
4
72
194
282
192
Landscape Ecology
4
71
19
41
193
Food Security
3
70
13
20
194
Psychology
6
68
1218
3071
195
Hazardous waste
3
67
24
82
195
United States
6
67
1147
2113
197
Scandinavia
3
65
54
88
198
Statistics
5
61
648
996
198
negotiation
2
61
23
12
198
Product life cycle
1
61
48
48
198
green products
1
61
45
48
198
conflict management
2
61
36
36
203
Vaccines
1
60
370
295
204
Urban Policy
1
58
73
62
205
Geochemical Modeling
3
57
137
248
205
geological modeling
3
57
145
257
207
Solar Energy
1
56
195
133
207
Obesity
2
56
2108
2973
209
Cytology
1
54
5693
5133
209
Cell Biology
1
54
7435
7032
209
raw materials
3
54
1
1
212
Cost of illness
2
53
8
5
212
Socioeconomic Factors
2
53
81
102
214
System analysis
6
52
67
237
215
Urbanization
4
51
5
15
216
Cybernetics
6
50
36
123
217
Economic Geography
3
49
34
87
217
Urban Economics
3
49
20
65
217
Globalization
3
49
38
98
220
air quality management
1
48
356
420
220
radioactive waste
2
48
25
93
220
industrial waste
2
48
27
93
223
Asia
4
45
428
768
223
Cognition
1
45
899
726
225
Biometrics
5
44
509
862
226
software
1
43
72
97
227
Education
2
42
992
1031
228
Regional Development
2
41
68
124
228
Development planning
2
41
54
106
228
Economic planning
2
41
74
133
231
Photogrammetry
3
40
45
37
231
Information Science
3
40
173
447
233
Game Theory
3
39
24
39
233
Evolutionary economics
1
39
16
12
233
poverty
1
39
73
52
233
Groundwater
1
39
150
132
237
Nuclear Energy
3
38
117
111
238
France
2
37
7
9
239
Medical Anthropology
3
36
198
555
239
atmosphere
2
36
82
152
241
Global warming
1
35
10
9
242
forestry
2
34
13
20
242
rivers
1
34
247
200
244
Electrical Engineering
1
33
1214
497
244
Nuclear Engineering
1
33
293
163
246
Systems Theory
3
32
27
83
247
Control Theory
2
31
1012
1123
247
Environmental Geochemistry
2
31
24
55
247
Minerals
2
31
28
78
250
Public Policy
1
30
481
529
250
Systems Analysis
1
30
110
100
250
behavioral medicine
1
30
307
449
253
Developed countries
1
29
32
46
254
Forecasting
2
28
117
213
254
Environmental risk assessment
3
28
37
181
254
Building
1
28
97
61
257
Human Geography
2
27
195
421
258
Marine Biology
3
26
179
465
258
Hydraulic Engineering
1
26
69
88
258
Hydrodynamics
1
26
43
56
261
Astronomy
1
25
501
570
261
International Relations
1
25
231
185
261
Sustainable agriculture
3
25
51
157
261
Africa
1
25
495
389
261
international cooperation
1
25
156
278
266
Geodesy
1
22
67
76
266
Input-output analysis
1
22
66
90
266
eugenics
2
22
103
299
269
World Bank
1
21
19
53
270
Optics
3
20
768
1218
270
Photography
3
20
148
101
270
Tourism
1
20
235
419
270
Business
1
20
513
605
270
Hospitality industry
1
20
16
31
275
Process Control
1
19
49
144
275
Social Security
1
19
12
9
275
Production Management
1
19
313
598
275
Gerontology
5
19
216
954
275
Elderly
3
19
156
195
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older people
3
19
205
397
275
sustainable growth
1
19
1
7
275
organization
1
19
46
81
283
Biochemical Engineering
1
18
1032
1776
284
Geochemistry
2
17
605
1568
284
polar regions
2
17
41
103
286
Biophysics
3
16
2259
7158
286
Systems Engineering
4
16
116
347
286
Philosophy
2
16
461
498
286
Tropical Medicine
1
16
1603
1989
286
Fuzzy systems
2
16
72
140
291
Differential Equations
2
15
44
77
291
Propulsion Systems
1
15
1
1
291
Solitons
1
15
95
141
291
Fractals
1
15
103
149
291
Chaos
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15
95
141
291
population policy
2
15
14
40
291
Antarctica
1
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51
52
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Macroeconomics
1
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20
48
298
Mathematical Physics
2
14
577
1011
298
Public Finance
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107
86
298
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14
23
27
298
freshwater biology
1
14
549
991
303
Agronomy
2
13
150
419
304
Nutrition
1
12
3441
6060
304
Regional Economics
2
12
48
185
304
food consumption
1
12
15
25
307
Marine Meteorology
1
11
47
76
307
Bioethics
4
11
87
559
307
Medical Ethics
4
11
133
571
307
Cosmochemistry
1
11
68
122
311
Japan
1
10
749
1129
311
telemarketing
1
10
10
24
313
Artificial Intelligence
1
9
1948
3469
313
Computational Biology
2
9
846
3017
313
Urban Areas
2
9
13
33
316
Risk assessment
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8
65
134
316
ecological risk assessment
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27
54
316
Health Risk Assessment
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8
57
104
319
Population Genetics
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7
974
3594
319
Intelligent Control Systems
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7
103
219
319
Organic farming
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6
15
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Visual Perception
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4053
6939
319
Memory
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7
4074
6983
319
Attention
1
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4061
6965
319
Australia
1
7
1632
2864
319
Perception
1
7
4071
6960
319
energy crops
1
7
1
1
328
Nonparametric Statistics
1
6
10
18
328
economic forecasting
3
6
15
91
328
Ornithology
1
6
404
875
328
Eastern Europe
3
6
69
282
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Soviet Union
3
6
62
169
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Birds
1
6
490
970
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mathematical concepts
1
6
292
780
335
marketing
1
5
312
632
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economic conditions
1
5
174
332
337
Global Health
1
4
336
1102
337
Migration
1
4
13
40
337
finance
3
4
218
876
340
Information Technology
1
3
524
1401
340
Geomorphology
1
3
551
1374
340
Mental Health
2
3
518
1869
340
Green Technology
1
3
26
76
340
Biological Systems
1
3
91
243
340
Multivariate Analysis
2
3
21
103
340
bioclimatology
1
3
87
208
340
Radiation
1
3
277
650
340
Social Systems
1
3
13
53
340
Flood forecasting
1
3
114
482
340
Adaptive control systems
1
3
346
787
340
Computational Complexity
1
3
87
190
340
Flood control
1
3
229
788
340
Educational evaluation
1
3
20
45
340
Behavior
2
3
1032
3924
340
Psychophysiology
2
3
1094
3467
356
Atmospheric Science
1
2
23
52
356
Sustainable Engineering
1
2
2043
4511
356
Numerical Analysis
2
2
394
1857
356
Stochastic Processes
1
2
302
679
356
air quality
1
2
28
59
356
Marine resources
1
2
59
170
362
management
1
1
1593
4189
362
Methodology
2
1
25
144
364
Actuarial Science
2
0
18
76
364
Environmental Ethics
1
0
70
272
364
Engineering Mathematics
2
0
636
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