@article{ZNSL_1984_140_a8,
     author = {M. A. Kovalevskii},
     title = {An integral representation of solutions and the problem of coupling factors for a~linear differential equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {88--104},
     year = {1984},
     volume = {140},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a8/}
}