@article {MATHEDUC.05701693,
author = {Gebhardt, Olav and Overholt, Marius},
title = {A combinatorial curiosity. (Et kombinatorisk kuriosum.)},
year = {2009},
journal = {Normat},
volume = {57},
number = {4},
issn = {0801-3500},
pages = {170-172},
publisher = {Nationellt Centrum f\"or Matematikutbildning (NCM), G\"oteborgs Universitet, G\"oteborg},
abstract = {Summary: Given $n$ strands of black and white pearls, each of length $k$. Assume that each pair of strands agree in at least $m$ more positions than they disagree, and that at each position the excess number of pearls of one color over the other across the strands is at most $d$. The authors find a necessary condition on $n,k,m$ and $d$, and prove it both combinatorially and by linear algebra.},
msc2010 = {K25xx},
identifier = {2010b.00570},
}