@article{DAN_1962_147_4_a11,
     author = {M. A. Rutman},
     title = {Criteria for the boundedness of solutions of linear partial differential equations with a leading term},
     journal = {Doklady Akademii Nauk},
     pages = {789--792},
     publisher = {mathdoc},
     volume = {147},
     number = {4},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_147_4_a11/}
}