@incollection{SB_1997-1998__40__341_0,
     author = {Van der Put, Marius},
     title = {Recent work on differential {Galois} theory},
     booktitle = {S\'eminaire Bourbaki : volume 1997/98, expos\'es 835-849},
     series = {Ast\'erisque},
     note = {talk:849},
     pages = {341--367},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {252},
     year = {1998},
     mrnumber = {1685624},
     zbl = {0931.12008},
     language = {en},
     url = {http://archive.numdam.org/item/SB_1997-1998__40__341_0/}
}