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@article{CMH_1967__42_139346, author = {Newton S. Hawley}, title = {Some {Remarks} concerning {Surfaces} in {Three-space.}}, journal = {Commentarii mathematici Helvetici}, pages = {307--313}, publisher = {mathdoc}, volume = {42}, year = {1967}, zbl = {0162.53002}, url = {http://geodesic.mathdoc.fr/item/CMH_1967__42_139346/} }
Newton S. Hawley. Some Remarks concerning Surfaces in Three-space.. Commentarii mathematici Helvetici, Tome 42 (1967), pp. 307-313. http://geodesic.mathdoc.fr/item/CMH_1967__42_139346/