@article{10_4153_CJM_1968_081_7,
     author = {Patty, C. W.},
     title = {Homology of {Deleted} {Products} of {Contractible} {2-Dimensional} {Polyhedra.} {II}},
     journal = {Canadian journal of mathematics},
     pages = {842--854},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-081-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-081-7/}
}