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@article{RCM_1993__27_1-2_181864, author = {Graciela Silvia Birman}, title = {Total absolute curvature of curves in {Lorentz} {Manifolds}}, journal = {Revista colombiana de matematicas}, pages = {9--14}, publisher = {mathdoc}, volume = {27}, number = {1-2}, year = {1993}, zbl = {0818.53002}, url = {http://geodesic.mathdoc.fr/item/RCM_1993__27_1-2_181864/} }
Graciela Silvia Birman. Total absolute curvature of curves in Lorentz Manifolds. Revista colombiana de matematicas, Tome 27 (1993) no. 1-2, pp. 9-14. http://geodesic.mathdoc.fr/item/RCM_1993__27_1-2_181864/