Impact Factor
2.94
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.
Supplements accompany some numbers.
Also issued online.
Indexes: Vols. 1-20, 1958-73. 1 v.
Vol. 47, no. 1 (JAN 1987)19890816 Notice published Printed on acid-free paper