Impact Factor
3.44
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.
Some vols. have supplements.
Print issues ceased with v. 45, no. 12 (Dec. 2015).
Also issued online.
Vol. 21, no. 1 (JAN 1991)19910912 Notice published Printed on acid-free paper