@article{DAN_1987_296_2_a6,
     author = {N. I. Popivanov},
     title = {A nonlocal analogue of a three-dimensional {Frankl--Morawetz} problem},
     journal = {Doklady Akademii Nauk},
     pages = {287--291},
     publisher = {mathdoc},
     volume = {296},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_2_a6/}
}