00657nam0-22002411i-450-990001161770403321000116177FED01000116177(Aleph)000116177FED0100011617720000920d1979----km-y0itay50------baengStudies in Algebra and Number TheoryNew York [etc.]Academic Press1979Edited by Gian-Carlo RotaITUNINARICAUNIMARCBK990001161770403321184-C-1419835MA1MA1Studies in Algebra and Number Theory346844UNINAING01