@article{DAN_1993_331_3_a8,
     author = {V. Ya. Yakubov},
     title = {Sharp estimates for $L_2$-normalized eigenfunctions of an},
     journal = {Doklady Akademii Nauk},
     pages = {286--287},
     publisher = {mathdoc},
     volume = {331},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_3_a8/}
}