@article{MZM_1972_11_1_a12,
     author = {V. M. Khrapchenko},
     title = {The complexity of the realization of symmetrical functions by formulae},
     journal = {Matemati\v{c}eskie zametki},
     pages = {109--120},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_1_a12/}
}