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@article{10_4064_cm_26_1_157_163, author = {K. Radziszewski}, title = {\ensuremath{\pi}-geodesics and lines of shadow}, journal = {Colloquium Mathematicum}, pages = {157--163}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1972}, doi = {10.4064/cm-26-1-157-163}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-26-1-157-163/} }
K. Radziszewski. π-geodesics and lines of shadow. Colloquium Mathematicum, Tome 26 (1972) no. 1, pp. 157-163. doi : 10.4064/cm-26-1-157-163. http://geodesic.mathdoc.fr/articles/10.4064/cm-26-1-157-163/
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