@article{RM_2011_66_1_a2,
     author = {R. R. Gontsov and V. A. Poberezhnyi and G. F. Helminck},
     title = {On deformations of linear differential systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {63--105},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2011_66_1_a2/}
}