@article{1138846767,
author = {Sakamoto, Kunio},
title = {Submanifolds satisfying the condition $K(X,\,Y)\cdot K=0$},
journal = {Kodai Math. Sem. Rep.},
volume = {25},
number = {1},
year = {1973},
pages = { 143-152},
language = {en},
url = {http://dml.mathdoc.fr/item/1138846767}
}
Sakamoto, Kunio. Submanifolds satisfying the condition $K(X,\,Y)\cdot K=0$. Kodai Math. Sem. Rep., Tome 25 (1973) no. 1, pp. 143-152. http://gdmltest.u-ga.fr/item/1138846767/