@article{1183423629,
author = {Lovitt, W. V.},
title = {Singular points of transformations and two-parameter families of curves},
journal = {Bull. Amer. Math. Soc.},
volume = {23},
number = {2},
year = {1916},
pages = { 387-393},
language = {en},
url = {http://dml.mathdoc.fr/item/1183423629}
}
Lovitt, W. V. Singular points of transformations and two-parameter families of curves. Bull. Amer. Math. Soc., Tome 23 (1916) no. 2, pp. 387-393. http://gdmltest.u-ga.fr/item/1183423629/