@article{INTA_1990_28_a1,
     author = {M. M. Zarichnyi and V. V. Fedorchuk},
     title = {Covariant functors in categories of topological spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya},
     pages = {47--95},
     year = {1990},
     volume = {28},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1990_28_a1/}
}