@article{10_4064_fm_77_1_5_7,
     author = {E. Tymchatyn},
     title = {Partial order and collapsibility of 2-complexes},
     journal = {Fundamenta Mathematicae},
     pages = {5--7},
     publisher = {mathdoc},
     volume = {77},
     number = {1},
     year = {1972},
     doi = {10.4064/fm-77-1-5-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-77-1-5-7/}
}