Impact Factor
2.81
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.
Publication suspended 1939-47.
Also issued online.
Text in German, French, and English: summaries in those three languages.
Vol. 77, no. 1 (1991)19911108 Notice published Printed on acid-free paper