@article{IVM_1993_11_a13,
     author = {Yu. G. Abakumov and V. G. Banin},
     title = {On approximation by linear quasi-positive and positive operators on a~finite interval},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {80--82},
     publisher = {mathdoc},
     number = {11},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1993_11_a13/}
}