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World Patent Information10.1016/0172-2190(83)90240-519835149The extraction of technical trend information from patent literaturehttps://api.elsevier.com/content/article/PII:0172219083902405?httpAccept=text/xml, https://api.elsevier.com/content/article/PII:0172219083902405?httpAccept=text/plain
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World Patent Information10.1016/s0172-2190(97)90111-31997193240Keyword Extraction Using a Text Format and Word Importance in a Specific Fieldhttps://api.elsevier.com/content/article/PII:S0172219097901113?httpAccept=text/xml, https://api.elsevier.com/content/article/PII:S0172219097901113?httpAccept=text/plain
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World Patent Information10.1016/0172-2190(87)90189-x19879118-26Patent analysis using online databases—I. Technological trend analysisR.M. Wilsonhttps://api.elsevier.com/content/article/PII:017221908790189X?httpAccept=text/xml, https://api.elsevier.com/content/article/PII:017221908790189X?httpAccept=text/plain
World Patent Information10.1016/0172-2190(89)90040-9198911154An analysis of patent applications in Chinahttps://api.elsevier.com/content/article/PII:0172219089900409?httpAccept=text/xml, https://api.elsevier.com/content/article/PII:0172219089900409?httpAccept=text/plain
World Patent Information10.1016/0172-2190(92)90169-j199214154Australian patent applications 1979–1989: An analysishttps://api.elsevier.com/content/article/PII:017221909290169J?httpAccept=text/xml, https://api.elsevier.com/content/article/PII:017221909290169J?httpAccept=text/plain