@article{GDZPPN002067110, title = {A generalized Hopf formula for higher homology groups.}, journal = {Commentarii mathematici Helvetici}, volume = {64}, year = {1989}, pages = {187-199}, zbl = {0685.20038}, url = {http://dml.mathdoc.fr/item/GDZPPN002067110} }
Stöhr, Ralph. A generalized Hopf formula for higher homology groups.. Commentarii mathematici Helvetici, Tome 64 (1989) pp. 187-199. http://gdmltest.u-ga.fr/item/GDZPPN002067110/