@article{MVK_2015_6_a1,
     author = {S. P. Gorshkov},
     title = {Functions from {Schaefer} classes having negations belonging to other {Schaefer} classes},
     journal = {Matemati\v{c}eskie voprosy kriptografii},
     pages = {23--48},
     publisher = {mathdoc},
     volume = {6},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MVK_2015_6_a1/}
}