@article{DAN_1980_255_4_a17,
     author = {E. V. Radkevich},
     title = {Boundary-variation method in {Pozzi--Friedman} problems},
     journal = {Doklady Akademii Nauk},
     pages = {839--843},
     publisher = {mathdoc},
     volume = {255},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_4_a17/}
}