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@article{IM_1989__96_1_143676, author = {Mark Spivakovsky}, title = {A counterexample to the theorem of {Beppo} {Levi} in three dimensions.}, journal = {Inventiones mathematicae}, pages = {181--184}, publisher = {mathdoc}, volume = {96}, number = {1}, year = {1989}, zbl = {0688.14012}, url = {http://geodesic.mathdoc.fr/item/IM_1989__96_1_143676/} }
Mark Spivakovsky. A counterexample to the theorem of Beppo Levi in three dimensions.. Inventiones mathematicae, Tome 96 (1989) no. 1, pp. 181-184. http://geodesic.mathdoc.fr/item/IM_1989__96_1_143676/