@article{1178242948, author = {Blair, D. E. and Ludden, G. D.}, title = {Hypersurfaces in almost contact manifolds}, journal = {Tohoku Math. J. (2)}, volume = {21}, number = {4}, year = {1969}, pages = { 354-362}, language = {en}, url = {http://dml.mathdoc.fr/item/1178242948} }
Blair, D. E.; Ludden, G. D. Hypersurfaces in almost contact manifolds. Tohoku Math. J. (2), Tome 21 (1969) no. 4, pp. 354-362. http://gdmltest.u-ga.fr/item/1178242948/