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@article{MS2_1979__44_166637, author = {Gudlaugur Thorbergsson}, title = {Non-hyperbolic closed geodesics.}, journal = {Mathematica Scandinavica}, pages = {135--148}, publisher = {mathdoc}, volume = {44}, year = {1979}, zbl = {0414.53037}, url = {http://geodesic.mathdoc.fr/item/MS2_1979__44_166637/} }
Gudlaugur Thorbergsson. Non-hyperbolic closed geodesics.. Mathematica Scandinavica, Tome 44 (1979), pp. 135-148. http://geodesic.mathdoc.fr/item/MS2_1979__44_166637/