%0 Journal Article %A Allan Sieradski %T Non-uniqueness of homotopy factorizations into irreducible polyhedra %J Fundamenta Mathematicae %D 1971 %P 97-99 %V 72 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-72-2-97-99/ %R 10.4064/fm-72-2-97-99 %G en %F 10_4064_fm_72_2_97_99