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Model, F.: 'Citation indexing' und Rückwärtskatalogisierung' : Beispiele für Zitatendokumentation (1964)
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Malin, M.V.: ¬The Science Citation Index : a new concept in indexing (1968)
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Garfield, E.; Sher, I.H.: New factors in the evaluation of scientific literature literature through citation indexing (1963)
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