@article{MZM_2005_78_6_a5,
     author = {S. S. Marchenkov},
     title = {On the {Cardinality} of the {Family} of {Precomplete} {Classes} in~$P_E$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {864--869},
     publisher = {mathdoc},
     volume = {78},
     number = {6},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_6_a5/}
}