@article{10_4064_fm_72_2_97_99,
     author = {Allan Sieradski},
     title = {Non-uniqueness of homotopy factorizations into irreducible polyhedra},
     journal = {Fundamenta Mathematicae},
     pages = {97--99},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {1971},
     doi = {10.4064/fm-72-2-97-99},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-72-2-97-99/}
}