@article{1183494160, author = {Wong, B. C.}, title = {On certain ruled hypersurfaces of order $K-1$ in $r$-space}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 533-535}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494160} }
Wong, B. C. On certain ruled hypersurfaces of order $K-1$ in $r$-space. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 533-535. http://gdmltest.u-ga.fr/item/1183494160/