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@article{CMH_1989__64_1_140148, author = {Ralph St\"ohr}, title = {A generalized {Hopf} formula for higher homology groups.}, journal = {Commentarii mathematici Helvetici}, pages = {187--199}, publisher = {mathdoc}, volume = {64}, number = {1}, year = {1989}, zbl = {0685.20038}, url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140148/} }
Ralph Stöhr. A generalized Hopf formula for higher homology groups.. Commentarii mathematici Helvetici, Tome 64 (1989) no. 1, pp. 187-199. http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140148/