00754nam0-22002531i-450-990001131350403321000113135FED01000113135(Aleph)000113135FED0100011313520000920d1977----km-y0itay50------baengObstruction theory on homotopy classification of mapsby Baues.Berlin [etc.]Springer-Verlag1977Lecture Notes in Mathematics628Baues,Hans Joachim54336ITUNINARICAUNIMARCBK990001131350403321C-20-(62819640MA1MA1Obstruction theory on homotopy classification of maps345514UNINAING01