@article{TIMM_2014_20_4_a26,
     author = {A. G. Chentsov and E. G. Pytkeev},
     title = {Some topological structures of extensions of abstract reachability problems},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {312--329},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2014_20_4_a26/}
}