@article{MZM_1994_55_6_a7,
     author = {S. P. Levashkin},
     title = {Unimprovable derivative estimates of a solution of the {Dirichlet} problem for a biharmonic equation in bounded domains},
     journal = {Matemati\v{c}eskie zametki},
     pages = {80--89},
     publisher = {mathdoc},
     volume = {55},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_55_6_a7/}
}