@article{DE_1990_26_9_a16,
     author = {V. A. Nogin and B. S. Rubin},
     title = {Estimates for potentials with oscillating kernels that are connected with the {Helmholtz} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1608--1613},
     publisher = {mathdoc},
     volume = {26},
     number = {9},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_9_a16/}
}