@article{ZNSL_1991_192_a2,
     author = {D. Yu. Grigor'ev},
     title = {Complexity of irreducibility testing for a system of linear ordinary differential equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {60--68},
     year = {1991},
     volume = {192},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_192_a2/}
}