@article{1183513481,
author = {Kosambi, D. D.},
title = {The differential invariants of a two-index tensor},
journal = {Bull. Amer. Math. Soc.},
volume = {55},
number = {12},
year = {1949},
pages = { 90-94},
language = {en},
url = {http://dml.mathdoc.fr/item/1183513481}
}
Kosambi, D. D. The differential invariants of a two-index tensor. Bull. Amer. Math. Soc., Tome 55 (1949) no. 12, pp. 90-94. http://gdmltest.u-ga.fr/item/1183513481/