2013å¹´12æ18æ¥ãç±³å½åºç社åä¼ï¼Association of American Publishersï¼AAPï¼ã®è³éæä¾ã«ãã調æ»ããããå¦è¡èªã»å°éèªã«æ²è¼ãããè«æã®å©ç¨å¾åã«é¢ããã¬ãã¼ããå ¬è¡¨ããã¾ããã13ã®åºç社ããåºçããããç§å¦ã社ä¼ç§å¦ã人æç§å¦åéã«ãããã2,812èªã®å¦è¡èªã»å°éèªã®âusage half-lifeâï¼å©ç¨åæ¸æï¼éèªã«æ²è¼ãããè«æã®ç´¯ç©ãã¦ã³ãã¼ãæ°ãç·ãã¦ã³ãã¼ãæ°ã®ååã«éããã¾ã§ã®æéã®å¹³åå¤ï¼ã調æ»ããåæããå ±åæ¸ã¨ã®ãã¨ã§ãã NEW REPORT RELEASED TRACKING USAGE PATTERN OF ACADEMIC JOURNAL ARTICLES (AAP, 2013/12/18) http://publishers.org/press/124/ Journal Usage Half-Life (PDF)

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