@article{MT_2023_26_1_a2,
     author = {V. G. Durnev and A. I. Zetkina},
     title = {An extension of a theorem of {Neumann}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {41--46},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2023_26_1_a2/}
}