@article{GDZPPN00232816X,
title = {Planar Geodesic Immersions in Pseudo-Euclidean Space.},
journal = {Mathematische Annalen},
volume = {275},
year = {1986},
pages = {585-598},
zbl = {0572.53042},
url = {http://dml.mathdoc.fr/item/GDZPPN00232816X}
}
Blomstrom, Carol. Planar Geodesic Immersions in Pseudo-Euclidean Space.. Mathematische Annalen, Tome 275 (1986) pp. 585-598. http://gdmltest.u-ga.fr/item/GDZPPN00232816X/