@article{DAN_1972_205_6_a9,
     author = {D. A. Raikov},
     title = {On a class of correspondence categories},
     journal = {Doklady Akademii Nauk},
     pages = {1300--1303},
     publisher = {mathdoc},
     volume = {205},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_205_6_a9/}
}