@article{03947102, title = {Pseudo-Riemannian manifolds endowed with an almost para f-structure.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {8}, year = {1985}, pages = {257-266}, doi = {10.1155/S016117128500028X}, zbl = {0589.53035}, language = {en}, url = {http://dml.mathdoc.fr/item/03947102} }
Goldberg, Vladislav V.; Rosca, Radu. Pseudo-Riemannian manifolds endowed with an almost para f-structure.. International Journal of Mathematics and Mathematical Sciences, Tome 8 (1985) pp. 257-266. doi : 10.1155/S016117128500028X. http://gdmltest.u-ga.fr/item/03947102/