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1Livre
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2par Colloquium on combinatorial theory and its applications
North-Holland cop.1970, cop. 1970Livre -
3par Colloquium on infinite and finite sets
North-Holland publishing company copyright 1975Livre -
4par Colloquium on combinatorial theory and its applications
Bolyai János Matematikai Társulat copyright 1970Livre -
5par Colloquium on combinatorial theory and its applications
Bolyai János Matematikai Társulat copyright 1970Livre