no. 3
Galois properties of linear differential equations
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 13 (2004) no. 3, pp. 459-475 
@article{AFST_2004_6_13_3_459_0,
     author = {Van der Put, Marius},
     title = {Galois properties of linear differential equations},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {459--475},
     year = {2004},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 13},
     number = {3},
     zbl = {1094.34061},
     language = {en},
     url = {https://www.numdam.org/item/AFST_2004_6_13_3_459_0/}
}
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Van der Put, Marius. Galois properties of linear differential equations. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 13 (2004) no. 3, pp. 459-475. https://www.numdam.org/item/AFST_2004_6_13_3_459_0/

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