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Content

Contribution to the 30th anniversary issue of 'Probleme de Informare si Documentare' - Reprint of an article which originally appeared in 'Probleme de Informare si Documentare 13(1978) no.2, S.43-64'

Date

22. 2.1999 16:16:11

Source

Probleme de Informare si Documentare. 31(1997) nos.3/4, S.207-220