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  1. 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) 10.31
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  2. Schön, J.: ¬Der Thesaurus of Engineering and Scientific terms (TEST) : Entstehungsgeschichte und Aufbau (1970) 10.31
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  3. Zijlstra, B.H.A.: History of US STI and subject categories (1994) 10.31
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