@article{MMO_1975_33_a4,
     author = {D. A. Raǐkov},
     title = {Categories of relations with a~quasizero object},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {223--261},
     publisher = {mathdoc},
     volume = {33},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1975_33_a4/}
}