@article{TIMM_2019_25_4_a4,
     author = {S. Benarab and E. S. Zhukovskiy and W. Merchela},
     title = {Theorems on perturbations of covering mappings in spaces with a distance and in spaces with a binary relation},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {52--63},
     year = {2019},
     volume = {25},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2019_25_4_a4/}
}