@article{NAM_1868_2_7__209_0,
     author = {Battaglini, G.},
     title = {Sur la g\'eom\'etrie imaginaire de {Lobatcheffsky}},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {209--221},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 7},
     year = {1868},
     language = {fr},
     url = {http://archive.numdam.org/item/NAM_1868_2_7__209_0/}
}