@article{MZM_2008_83_5_a1,
     author = {A. A. Esin},
     title = {On {Function} {Classes} in $P_3$ {Precomplete} with {Respect} to a {Strengthened} {Closure} {Operator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {650--660},
     publisher = {mathdoc},
     volume = {83},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2008_83_5_a1/}
}