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@article{IVM_1972_4_a10, author = {D. A. Raikov}, title = {Orthogonal morphisms and the notion of bicategory}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {93--101}, publisher = {mathdoc}, number = {4}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1972_4_a10/} }
D. A. Raikov. Orthogonal morphisms and the notion of bicategory. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1972), pp. 93-101. http://geodesic.mathdoc.fr/item/IVM_1972_4_a10/