Impact Factor
4.15
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. 25 (2020).
Also issued online.
v. 3, no. 2 (April 15, 1998)19991214 Notice published Printed on acid-free paper that meets the full ANSI standard for Permanent Paper