@article{TM_1987_176_a10,
     author = {A. V. Bitsadze and V. S. Vinogradov and A. A. Dezin and V. A. Il'in},
     title = {Partial differential equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {259--299},
     publisher = {mathdoc},
     volume = {176},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_176_a10/}
}