@article{DAN_1979_245_4_a2,
     author = {Yu. A. Mamatov},
     title = {Concerning a principle for obtaining lower bounds on the complexity of formulas},
     journal = {Doklady Akademii Nauk},
     pages = {782--784},
     publisher = {mathdoc},
     volume = {245},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_245_4_a2/}
}