@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/}
}