@article{RM_1970_25_1_a12,
     author = {I. A. Shishmarev},
     title = {Estimates exact in a~closed domain of the eigenfunctions of the polyharmonic operator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_1_a12/}
}