A Lower Bound on the Area of a 3-Coloured Disk Packing

Peter Brass Ferran Hurtado Benjamin J. Lafreniere Anna Lubiw A Lower Bound on the Area of a 3-Coloured Disk Packing http://arxiv.org/abs/0804.1173 2008 CoRR abs/0804.1173 db/journals/corr/corr0804.html#abs-0804-1173 informal publication