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@article{MAN_1986__276_164184, author = {D.N. Kupeli}, title = {On {Existence} and {Comparison} of {Conjugate} {Points} in {Riemannian} and {Lorentzian} {Geometry.}}, journal = {Mathematische Annalen}, pages = {67--80}, publisher = {mathdoc}, volume = {276}, year = {1986}, zbl = {0585.53037}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__276_164184/} }
D.N. Kupeli. On Existence and Comparison of Conjugate Points in Riemannian and Lorentzian Geometry.. Mathematische Annalen, Tome 276 (1986), pp. 67-80. http://geodesic.mathdoc.fr/item/MAN_1986__276_164184/