@article{DAN_1961_141_3_a6,
     author = {Ya. M. Zhileikin},
     title = {On a refinement of the bound of the spectral function of the {Laplace} operator},
     journal = {Doklady Akademii Nauk},
     pages = {543--546},
     publisher = {mathdoc},
     volume = {141},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_3_a6/}
}