@article{DAN_1989_309_4_a3,
     author = {M. I. Grinchuk},
     title = {On the complexity of relay contact networks realizing symmetric},
     journal = {Doklady Akademii Nauk},
     pages = {787--791},
     publisher = {mathdoc},
     volume = {309},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_4_a3/}
}