@article{JOLT_2015_25_1_a7,
     author = {Giampaolo Cicogna and Giuseppe Gaeta and Sebastian Walcher},
     title = {Side {Conditions} for {Ordinary} {Differential} {Equations}},
     journal = {Journal of Lie Theory},
     pages = {125--146},
     year = {2015},
     volume = {25},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2015_25_1_a7/}
}