@article{CMH_1970__45_139453,
     author = {P.J. Hilton and J. Roitberg},
     title = {On the {Classification} {Problem} for {H-Spaces} of {Rank} {Two.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {506--516},
     publisher = {mathdoc},
     volume = {45},
     year = {1970},
     zbl = {0205.53202},
     url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139453/}
}