@article{DAN_1977_237_4_a8,
     author = {M. Sh. Tsalenko},
     title = {The structure of correspondence categories},
     journal = {Doklady Akademii Nauk},
     pages = {786--789},
     publisher = {mathdoc},
     volume = {237},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_4_a8/}
}