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  1. Efthimiadis, E.N.; Mitev, N.N.: ¬A classified bibliography on online public access catalogues (1987) 9.30 
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    Efthimiadis, E.N.
  2. Efthimiadis, E.N.; Neilson, C.: ¬A classified bibliography on online public access catalogues (1989) 9.30 
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    Efthimiadis, E.N.

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