@article{1183415472, author = {Lovett, Edgar Odell}, title = {Infinitesimal transformations of concentric conics}, journal = {Bull. Amer. Math. Soc.}, volume = {4}, number = {8}, year = {1898}, pages = { 520-524}, language = {en}, url = {http://dml.mathdoc.fr/item/1183415472} }
Lovett, Edgar Odell. Infinitesimal transformations of concentric conics. Bull. Amer. Math. Soc., Tome 4 (1898) no. 8, pp. 520-524. http://gdmltest.u-ga.fr/item/1183415472/