Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2008_38_2a_11, author = {V. Marenitch}, title = {Geodesic lines in $\widetilde{SL_2(R)}$ and $Sol$}, journal = {Novi Sad Journal of Mathematics}, pages = {91-104}, publisher = {mathdoc}, volume = {38}, number = {2}, year = {2008}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2008_38_2a_11/} }
V. Marenitch. Geodesic lines in $\widetilde{SL_2(R)}$ and $Sol$. Novi Sad Journal of Mathematics, Tome 38 (2008) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_2008_38_2a_11/