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@article{MAT_1966_10_4_a5, author = {H. Busemann}, title = {Extremals on closed hyperbolic space forms}, journal = {Matematika}, pages = {140--145}, publisher = {mathdoc}, volume = {10}, number = {4}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1966_10_4_a5/} }
H. Busemann. Extremals on closed hyperbolic space forms. Matematika, Tome 10 (1966) no. 4, pp. 140-145. http://geodesic.mathdoc.fr/item/MAT_1966_10_4_a5/