@article{SM_1976_30_3_a3,
     author = {E. Z. Dyment},
     title = {On some properties of the {Medvedev} lattice},
     journal = {Sbornik. Mathematics},
     pages = {321--340},
     year = {1976},
     volume = {30},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1976_30_3_a3/}
}