@article{01780526,
title = {On the curvature of nonregular saddle surfaces in the hyperbolic and spherical three-space.},
journal = {Abstract and Applied Analysis},
volume = {7},
year = {2002},
pages = {113-123},
doi = {10.1155/S1085337502000799},
zbl = {1029.53083},
language = {en},
url = {http://dml.mathdoc.fr/item/01780526}
}
Kalikakis, Dimitrios E. On the curvature of nonregular saddle surfaces in the hyperbolic and spherical three-space.. Abstract and Applied Analysis, Tome 7 (2002) pp. 113-123. doi : 10.1155/S1085337502000799. http://gdmltest.u-ga.fr/item/01780526/