Polyhedral products and commutator subgroups of right-angled Artin and   Coxeter groups
  We construct and study polyhedral product models for classifying spaces of right-angled Artin and Coxeter groups, general graph product groups and their commutator subgroups. By way of application, we give a criterion of freeness for the commutator subgroup of a graph product group, and provide an explicit minimal set of generators for the commutator subgroup of a right-angled Coxeter group. 
Taras Panov and Yakov Veryovkin
math.GR math.AT