@article{CMH_1972__47_139517,
     author = {John R. Harper},
     title = {Homotopy {Groups} of {H-Spaces} {I}},
     journal = {Commentarii mathematici Helvetici},
     pages = {311--331},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0253.55009},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139517/}
}