@article{DAN_1976_228_6_a6,
     author = {L. G. Mikhailov and V. Kreis},
     title = {On an overdetermined system of partial differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1286--1289},
     publisher = {mathdoc},
     volume = {228},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_6_a6/}
}