@article{MAN_1986__274_164118,
     author = {Carol Blomstrom},
     title = {Planar {Geodesic} {Immersions} in {Pseudo-Euclidean} {Space.}},
     journal = {Mathematische Annalen},
     pages = {585--598},
     publisher = {mathdoc},
     volume = {274},
     year = {1986},
     zbl = {0572.53042},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164118/}
}