@article{ZVMMF_2009_49_8_a1,
     author = {V. A. Abilov and M. K. Kerimov},
     title = {Sharp estimates for the convergence rate of double {Fourier} series in terms of orthogonal polynomials in the space $L_2((a,b)\times(c,d);p(x)q(y)))$},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1364--1368},
     publisher = {mathdoc},
     volume = {49},
     number = {8},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_8_a1/}
}