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Costers, L.: PICA: Gegenwart und Perspektiven (1993)
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Costers, L.: strategies for the further development of library networks (1994)
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Costers, L.: ¬The electronic library and its organizational management (1994)
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Koopman, R.: ¬Ein OPAC mit Gewichtungsalgorithmen : Der PICA Micro OPC (1996)
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