@article{10_4153_CJM_1968_039_3,
     author = {Patty, C. W.},
     title = {Homology of {Deleted} {Products} of {Contractible} {2-Dimensional} {Polyhedra.} {I}},
     journal = {Canadian journal of mathematics},
     pages = {416--441},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-039-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-039-3/}
}