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Busch, J.: ¬A method for evaluating the multiple relations between subject descriptors : related terms in the Thesaurus for Engineering and Scientific Terms, a pilot study (1978)
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Schön, J.: ¬Der Thesaurus of Engineering and Scientific terms (TEST) : Entstehungsgeschichte und Aufbau (1970)
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Zijlstra, B.H.A.: History of US STI and subject categories (1994)
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