@article{PDM_2008_1_a1,
     author = {S. P. Gorshkov},
     title = {On the complexity of weakly positive and weakly negative boolean functions reducing},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {7--9},
     publisher = {mathdoc},
     number = {1},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2008_1_a1/}
}