%0 Journal Article %A Teresa Crespo %A Zbigniew Hajto %T Picard–Vessiot Extensions of Real Differential Fields %J Symmetry, integrability and geometry: methods and applications %D 2019 %V 15 %U http://geodesic.mathdoc.fr/item/SIGMA_2019_15_a99/ %G en %F SIGMA_2019_15_a99