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@article{10_4064_ap_14_2_141_168, author = {O. Karwowski}, title = {Vertical lines and points of a surface}, journal = {Annales Polonici Mathematici}, pages = {141--168}, publisher = {mathdoc}, volume = {14}, number = {2}, year = {1963}, doi = {10.4064/ap-14-2-141-168}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-14-2-141-168/} }
O. Karwowski. Vertical lines and points of a surface. Annales Polonici Mathematici, Tome 14 (1963) no. 2, pp. 141-168. doi : 10.4064/ap-14-2-141-168. http://geodesic.mathdoc.fr/articles/10.4064/ap-14-2-141-168/
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