@article{JOLT_2015_25_1_a7,
     author = {G. Cicogna and G. Gaeta and S. Walcher},
     title = {Side {Conditions} for {Ordinary} {Differential} {Equations}},
     journal = {Journal of Lie Theory},
     pages = {125--146},
     year = {2015},
     volume = {25},
     number = {1},
     doi = {10.5802/jolt.831},
     zbl = {1351.34038},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.831/}
}