@article{DAN_1974_216_1_a11,
     author = {A. A. Tsygankov},
     title = {Simultaneous orthogonality of polynomials on a contour and over the area of a region},
     journal = {Doklady Akademii Nauk},
     pages = {46--48},
     publisher = {mathdoc},
     volume = {216},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_1_a11/}
}