Perreault, J.: Categories and relators : a new schema (1994)
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- Footnote
- Reprint von: Rev. Int. Doc. 32(1965) no.4, S.136-144; dto. als FID/CR report no.4 u. im Buch des Verf.: Towards a theory for UDC. London: Bingley 1969, S.119-148
