Impact Factor
3.64
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.
Title from cover.
Print issues ceased with v. 97, no. 12 (2012).
Also issued online.
Vol. 75, no. 1 (1990)19920824 Notice not published Printed on acid-free paper