@article{CMH_1975__50_251484,
     author = {Wu Yi Hsiang},
     title = {Addendum to the {Paper} {Entitled:} },
     journal = {Commentarii mathematici Helvetici},
     pages = {277--280},
     publisher = {mathdoc},
     volume = {50},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/CMH_1975__50_251484/}
}