@article{VUU_2015_25_1_a12,
     author = {M. V. Kuchuganov},
     title = {Systems of relational transformations: rules and realizability criterion},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {117--125},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2015_25_1_a12/}
}