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@article{MOMA_1980__90_177990, author = {Bang-Yen Chen}, title = {Surfaces with {Parallel} {Normalized} {Mean} {Curvature} {Vector.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {185--194}, publisher = {mathdoc}, volume = {90}, year = {1980}, zbl = {0435.53040}, url = {http://geodesic.mathdoc.fr/item/MOMA_1980__90_177990/} }
Bang-Yen Chen. Surfaces with Parallel Normalized Mean Curvature Vector.. Monatshefte für Mathematik, Tome 90 (1980), pp. 185-194. http://geodesic.mathdoc.fr/item/MOMA_1980__90_177990/