@article{01271958,
title = {Multi-parameter symmetries of first order ordinary differential equations.},
journal = {Journal of Lie Theory},
volume = {9},
year = {1999},
pages = {249-269},
zbl = {0947.34020},
language = {en},
url = {http://dml.mathdoc.fr/item/01271958}
}
Walcher, Sebastian. Multi-parameter symmetries of first order ordinary differential equations.. Journal of Lie Theory, Tome 9 (1999) pp. 249-269. http://gdmltest.u-ga.fr/item/01271958/