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æå2019-05-012019-05-012010https://scholars.lib.ntu.edu.tw/handle/123456789/406108Linkage indexesCo-assigneesReciprocal citationPatent couplingCo-patentCitation linkageA Comparative Study of Linkage Indexes: Co-assignee, Reciprocal Citation, Patent Coupling and Co-patentjournal article