@article{DAN_1974_217_2_a1,
     author = {R. K. Vasil'ev},
     title = {On some convergence questions for isotone and positive additive operators},
     journal = {Doklady Akademii Nauk},
     pages = {260--263},
     publisher = {mathdoc},
     volume = {217},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_217_2_a1/}
}