@article{10_4153_CMB_1982_033_8,
     author = {Keener, Lee L.},
     title = {A {New} {Proof} of the {Snake} {Theorem}},
     journal = {Canadian mathematical bulletin},
     pages = {234--237},
     year = {1982},
     volume = {25},
     number = {2},
     doi = {10.4153/CMB-1982-033-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-033-8/}
}