@article{UZKU_1969_129_3_a10,
     author = {Sh. I. Il'yasov},
     title = {Certain questions of systems of orthogonal polynomials that relate to a two-dimensional domain},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {120--124},
     publisher = {mathdoc},
     volume = {129},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1969_129_3_a10/}
}