@article{1138846947, author = {Sario, Leo}, title = {Quasiharmonic degeneracy of Riemannian $N$-manifolds}, journal = {Kodai Math. Sem. Rep.}, volume = {26}, number = {1}, year = {1974}, pages = { 53-57}, language = {en}, url = {http://dml.mathdoc.fr/item/1138846947} }
Sario, Leo. Quasiharmonic degeneracy of Riemannian $N$-manifolds. Kodai Math. Sem. Rep., Tome 26 (1974) no. 1, pp. 53-57. http://gdmltest.u-ga.fr/item/1138846947/