@article{DAN_1968_180_1_a16,
     author = {A. V. Kolpakov and R. N. Kuz'min},
     title = {Phase problem and the correlation properties of {X-ray} beams},
     journal = {Doklady Akademii Nauk},
     pages = {63--65},
     publisher = {mathdoc},
     volume = {180},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_1_a16/}
}