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@article{IM2_2020_84_1_a3, author = {M. B. Karmanova}, title = {Two-step {sub-Lorentzian} structures and graph surfaces}, journal = {Izvestiya. Mathematics }, pages = {52--94}, publisher = {mathdoc}, volume = {84}, number = {1}, year = {2020}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_2020_84_1_a3/} }
M. B. Karmanova. Two-step sub-Lorentzian structures and graph surfaces. Izvestiya. Mathematics , Tome 84 (2020) no. 1, pp. 52-94. http://geodesic.mathdoc.fr/item/IM2_2020_84_1_a3/