@article{CMH_1975__50_139606,
     author = {Erik Kjaer Pedersen},
     title = {Spines of {Topological} {Manifolds.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {41--44},
     publisher = {mathdoc},
     volume = {50},
     year = {1975},
     zbl = {0296.57003},
     url = {http://geodesic.mathdoc.fr/item/CMH_1975__50_139606/}
}