@article{DAN_1971_201_3_a6,
     author = {B. V. Pannikov},
     title = {On the convergence of {Riemann} sums for discontinuous functions},
     journal = {Doklady Akademii Nauk},
     pages = {542--544},
     publisher = {mathdoc},
     volume = {201},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_3_a6/}
}