@article{1183418882,
author = {Wright, J. E.},
title = {An application of the theory of differential invariants to triply orthogonal systems of surfaces},
journal = {Bull. Amer. Math. Soc.},
volume = {13},
number = {3},
year = {1906},
pages = { 379-382},
language = {en},
url = {http://dml.mathdoc.fr/item/1183418882}
}
Wright, J. E. An application of the theory of differential invariants to triply orthogonal systems of surfaces. Bull. Amer. Math. Soc., Tome 13 (1906) no. 3, pp. 379-382. http://gdmltest.u-ga.fr/item/1183418882/