@article{MZM_1999_65_4_a15,
     author = {G. A. Aigunov},
     title = {Asymptotic behavior of the normalized eigenfunctions of an operator of {Sturm--Liouville} type for partial differential equations in an $N$-dimensional ball},
     journal = {Matemati\v{c}eskie zametki},
     pages = {622--625},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_4_a15/}
}