@article{DAN_1968_181_5_a13,
     author = {A. S. Tsygankov},
     title = {Oscillations of functions biharmonic in the disc},
     journal = {Doklady Akademii Nauk},
     pages = {1080--1082},
     publisher = {mathdoc},
     volume = {181},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_5_a13/}
}