Impact Factor
3.72
Estimated influence, citation density, publishing volume, and citation integrity from the analytics table.
Volume, recency, access pattern, and citing-community signals from the journal analytics record.
Recent article records with DOI-first linking and condensed abstracts.
Print issues ceased with v. 36 (2014).
Issue for July 1984 called also "First issue."
Vol. 8, no. 3 (1988) published as a combined issue with v. 8, no. 2.
Also issued online.
Cosponsored by various members of the International Council of Scientific Unions
Vol. 10, no. 1 (1989)19920824 Notice not published Printed on acid-free paper