Impact Factor
1.97
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.
Imprint varies.
Print issues ceased with v. 39, no. 6 (2010)
Also issued online.
Vol. 9, no. 1 (1980)19890816 Notice published Printed on acid-free paper