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@article{PIM_1966_N_S_06_20_a4, author = {Stanimir Fempl}, title = {Eine {Eigenschaft} {Der} {Brachistochronen} {Im} {Wirbelfreien} {Felde}}, journal = {Publications de l'Institut Math\'ematique}, pages = {25 }, publisher = {mathdoc}, volume = {_N_S_06}, number = {20}, year = {1966}, url = {http://geodesic.mathdoc.fr/item/PIM_1966_N_S_06_20_a4/} }
Stanimir Fempl. Eine Eigenschaft Der Brachistochronen Im Wirbelfreien Felde. Publications de l'Institut Mathématique, _N_S_06 (1966) no. 20, p. 25 . http://geodesic.mathdoc.fr/item/PIM_1966_N_S_06_20_a4/