@article{SM_2009_200_4_a2,
     author = {G. A. Karagulyan},
     title = {On {Riemann} sums and maximal functions in~$\mathbb R^n$},
     journal = {Sbornik. Mathematics},
     pages = {521--548},
     publisher = {mathdoc},
     volume = {200},
     number = {4},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2009_200_4_a2/}
}