@article{MZM_1971_10_2_a11,
     author = {V. S. Shul'man},
     title = {The relation between lebesgue integrable and {Birkhoff--Khinchin} summable functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {219--228},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a11/}
}