@article{VMUMM_2003_2_a5,
     author = {S. N. Preobrazhenskii},
     title = {Periodic {Boolean} functions and a lower bound for the complexity of operators},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {25--28},
     year = {2003},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2003_2_a5/}
}