@article{TRSPY_1972_117_a3,
     author = {Ya. S. Bugrov},
     title = {Properties of solutions of differential equations of higher order in terms of weight classes},
     journal = {Informatics and Automation},
     pages = {47--61},
     publisher = {mathdoc},
     volume = {117},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1972_117_a3/}
}