@article{01505609, title = {Immersions with a parallel normal field.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {41}, year = {2000}, pages = {359-370}, zbl = {0980.53066}, language = {en}, url = {http://dml.mathdoc.fr/item/01505609} }
Carter, Sheila; Kaya, Yusuf. Immersions with a parallel normal field.. Beiträge zur Algebra und Geometrie, Tome 41 (2000) pp. 359-370. http://gdmltest.u-ga.fr/item/01505609/