@article{CHEB_2014_15_2_a8,
     author = {A. R. Esayan and N. M. Dobrovolsky},
     title = {Conceptual schemes},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {134--140},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2014_15_2_a8/}
}