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@article{PMF_1923-1924_33_1_a7, author = {Witwi\'nski, Romuald}, title = {La g\'eom\'etrie de direction}, journal = {Prace Matematyczno-Fizyczne}, pages = {99--114}, publisher = {mathdoc}, volume = {33}, number = {1}, year = {1923-1924}, language = {fr}, url = {http://geodesic.mathdoc.fr/item/PMF_1923-1924_33_1_a7/} }
Witwiński, Romuald. La géométrie de direction. Prace Matematyczno-Fizyczne, Tome 33 (1923-1924) no. 1, pp. 99-114. http://geodesic.mathdoc.fr/item/PMF_1923-1924_33_1_a7/