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@article{JLT_1999_9_1_a10, author = {S. Walcher}, title = {Multi-Parameter {Symmetries} of {First} {Order} {Ordinary} {Differential} {Equations}}, journal = {Journal of Lie theory}, pages = {249--269}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/JLT_1999_9_1_a10/} }
S. Walcher. Multi-Parameter Symmetries of First Order Ordinary Differential Equations. Journal of Lie theory, Tome 9 (1999) no. 1, pp. 249-269. http://geodesic.mathdoc.fr/item/JLT_1999_9_1_a10/