@article{SM_2009_200_3_a4,
     author = {A. O. Remizov},
     title = {Geodesics on 2-surfaces with {pseudo-Riemannian} metric: singularities of changes of signature},
     journal = {Sbornik. Mathematics},
     pages = {385--403},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2009_200_3_a4/}
}