This chart shows the 2-year article impact factor of Acta Crystallographica Section D: Structural Biology over time and its percentile among journals. Only research articles are counted in both the numerator (citations) and denominator (citable items).
How is the 2-year article impact calculated?
The 2-year article impact for year X equals the citations received in year X to research articles published in years X-1 and X-2, divided by the number of research articles published in those two years. Unlike the standard 2-year impact, only items classified as research articles are counted in both the numerator and denominator.
