@article{JRAM_1897__118_149019,
     author = {Geminiano Pirondini},
     title = {Sur les trajectoires isogonales des g\'en\'eratrices d'une surface d\'eveloppable.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {61--73},
     publisher = {mathdoc},
     volume = {118},
     year = {1897},
     zbl = {28.0554.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1897__118_149019/}
}