@article{DM_1992_4_4_a1,
     author = {A. A. Markov},
     title = {Calculation of {Boolean} functions by systems of formulas of bounded complexity},
     journal = {Diskretnaya Matematika},
     pages = {12--25},
     year = {1992},
     volume = {4},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1992_4_4_a1/}
}