@article{FPM_2012_17_1_a0,
     author = {S. A. Abramov and D. E. Khmelnov},
     title = {On singular points of solutions of linear differential systems with polynomial coefficients},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {3--21},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_1_a0/}
}