Vibrational Studies of Heteropolyanions Related to α-P<sub>2</sub>W<sub>18</sub>O<sub>62</sub><sup>6-</sup>I - Infrared Evidence of the Structure of α<sub>1</sub>and α<sub>2</sub>-P<sub>2</sub>W<sub>17</sub>O<sub>61</sub><sup>10−</sup>
Distribution of the number of citations over years.