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@article{PIM_1967_N_S_07_21_a20, author = {M. D. Leko}, title = {About twin paradox}, journal = {Publications de l'Institut Math\'ematique}, pages = {205 }, publisher = {mathdoc}, volume = {_N_S_07}, number = {21}, year = {1967}, url = {http://geodesic.mathdoc.fr/item/PIM_1967_N_S_07_21_a20/} }
M. D. Leko. About twin paradox. Publications de l'Institut Mathématique, _N_S_07 (1967) no. 21, p. 205 . http://geodesic.mathdoc.fr/item/PIM_1967_N_S_07_21_a20/