@article{DAN_1966_170_4_a11,
     author = {I. A. Shishmarev},
     title = {Exact estimates of the eigenfunctions of the biharmonic operator},
     journal = {Doklady Akademii Nauk},
     pages = {790--793},
     year = {1966},
     volume = {170},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_170_4_a11/}
}