@article{1183415668,
author = {Lovett, Edgar Odell},
title = {Darboux's Orthogonal Systems},
journal = {Bull. Amer. Math. Soc.},
volume = {6},
number = {3},
year = {1899},
pages = { 185-202},
language = {en},
url = {http://dml.mathdoc.fr/item/1183415668}
}
Lovett, Edgar Odell. Darboux's Orthogonal Systems. Bull. Amer. Math. Soc., Tome 6 (1899) no. 3, pp. 185-202. http://gdmltest.u-ga.fr/item/1183415668/