@article{DAN_1967_177_3_a3,
     author = {P. P. Korovkin},
     title = {The {Cauchy{\textendash}Riemann} and the {Lebesgue} integrals. {Intermediate} integrals},
     journal = {Doklady Akademii Nauk},
     pages = {505--507},
     year = {1967},
     volume = {177},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_3_a3/}
}