@article{JOLT_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},
     year = {1999},
     volume = {9},
     number = {1},
     doi = {10.5802/jolt.169},
     zbl = {0947.34020},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.169/}
}