@article{DAN_1991_317_2_a15,
     author = {N. N. Metel'skii and V. S. Krikun},
     title = {Placements of isothetic blocks that are optimal with respect to},
     journal = {Doklady Akademii Nauk},
     pages = {320--323},
     publisher = {mathdoc},
     volume = {317},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a15/}
}