@article{SEMR_2020_17_a139,
     author = {A. G. Kachurovskii and M. N. Lapshtaev and A. J. Khakimbaev},
     title = {Von {Neumann's} ergodic theorem and {Fejer} sums for signed measures on the circle},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1313--1321},
     publisher = {mathdoc},
     volume = {17},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2020_17_a139/}
}