Deza, M.; Shpectorov, S. (1996), "Recognition of the l1-graphs with complexity O(nm), or football in a hypercube", European Journal of Combinatorics, 17 (2–3): 279–289, doi:10.1006/eujc.1996.0024, MR1379378.
Deza, M.; Shpectorov, S. (1996), "Recognition of the l1-graphs with complexity O(nm), or football in a hypercube", European Journal of Combinatorics, 17 (2–3): 279–289, doi:10.1006/eujc.1996.0024, MR1379378.