@article{MZM_1976_19_4_a10,
     author = {E. B. Katsov},
     title = {Plane functors},
     journal = {Matemati\v{c}eskie zametki},
     pages = {577--586},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_4_a10/}
}