@article{DM_1990_2_1_a14,
     author = {Yu. I. Yanov},
     title = {Lower bounds on computation time},
     journal = {Diskretnaya Matematika},
     pages = {142--154},
     year = {1990},
     volume = {2},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_1_a14/}
}