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@article{MV_1971_23_1_a30, author = {T. Furuta}, title = {An elementary proof of {Hadamard's} theorem}, journal = {Matemati\v{c}ki vesnik}, pages = {267 }, publisher = {mathdoc}, volume = {23}, number = {1}, year = {1971}, url = {http://geodesic.mathdoc.fr/item/MV_1971_23_1_a30/} }
T. Furuta. An elementary proof of Hadamard's theorem. Matematički vesnik, Tome 23 (1971) no. 1, p. 267 . http://geodesic.mathdoc.fr/item/MV_1971_23_1_a30/