@article{MZM_1990_48_6_a9,
     author = {A. A. Razborov},
     title = {Lower bounds of the complexity of symmetric boolean functions of contact-rectifier circuits},
     journal = {Matemati\v{c}eskie zametki},
     pages = {79--90},
     publisher = {mathdoc},
     volume = {48},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_6_a9/}
}