@article{MZM_1986_40_4_a1,
     author = {A. V. Abanin},
     title = {Certain criteria for weak sufficiency},
     journal = {Matemati\v{c}eskie zametki},
     pages = {442--454},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_4_a1/}
}