@article{IVM_1972_7_a5,
     author = {O. B. Kozhevnikov},
     title = {Homomorphisms of categorial semigroups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {42--52},
     publisher = {mathdoc},
     number = {7},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_7_a5/}
}