00743nam0-22002891i-450-990002558440403321000255844FED01000255844(Aleph)000255844FED0100025584420000920d1965----km-y0itay50------baENGTheory of RetractsSze-Tsen Hu.DetroitWayne University Press1965.234 p.23 cmInsiemiStrutture algebriche516Hu,Sze-Tsen102630ITUNINARICAUNIMARCBK990002558440403321MXXV-A-135728MASMASTheory of Retracts355031UNINAING01