@article{ZVMMF_1972_12_2_a30,
     author = {V. V. Tumasonis},
     title = {Extension of the system of equivalent transformations of expressions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {552--556},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1972_12_2_a30/}
}