@article{TM_1980_156_a1,
     author = {G. G. Akopyan},
     title = {Sequences of cubature formulas for differentiable functions in domains with degenerate corners},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {4--15},
     year = {1980},
     volume = {156},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1980_156_a1/}
}