@article{MZM_1967_1_4_a2,
     author = {A. V. Efimov},
     title = {Generalization of a theorem of {Kaczmarz}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {399--404},
     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_4_a2/}
}