@article{DAN_1957_115_1_a2,
     author = {V. I. Volkov},
     title = {On the convergence of sequences of linear positive operators in the space of continuous functions of two variables},
     journal = {Doklady Akademii Nauk},
     pages = {17--19},
     publisher = {mathdoc},
     volume = {115},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_1_a2/}
}