Impact Factor
3.74
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.
Also issued online.
Some summaries in Spanish.
Indexes: Vols. 1-5, 1964-68, with v.5; Vols. 1-10, 1964-73. 1 v.
Vol. 28, no. 1 (1991)19920925 Notice published Printed on acid-free paper