Impact Factor
4.08
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. 7, no. 12 (Dec. 2005)
Also issued online.
v. 1, no. 1 (April 20, 1999)20000717 Notice not published Printed on acid-free paper