Impact Factor
2.84
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.
Monthly.
Title from cover.
Print issues ceased with v. 242, no. 12 (2013).
Also issued online.
Vol. 202, no. 3 (1995)19950519 Notice not published Printed on acid-free paper