00418cam a22001694a 4500003001000000005001700010008004100027040002500068041000800093044000800101080000700109100003000116245002900146260003000175650002400205655001900229AR-SsjUIB20250710155052.0250429s1973 xxu 000 0 spa d aAR-SsjUIBcAR-SsjUIB0 aspa axxu a511 aO'Brien, Horacio Hernán10aEstructuras algebraicas. aWashington :bOEA,c1973. 7aMatemáticas2lemb 7aLibro2unescot