00279nam a2200109Ia 4500082001900000100001800019245007800037260002800115300001600143500000500159700000500164  a510.8bL495.SP  aLefschetz, S.  aSelected papersbcBy S. Lefschetz including the book 'L' analysis situs'  aNew YorkbChelseac1971  a639p. Bibl.  a  a