@article{MO_2016_1_a4,
     author = {D. V. Gusev},
     title = {On {Finite} {State} {Automation} of 4 {Stones} which {Makes} the},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {23--43},
     year = {2016},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2016_1_a4/}
}