K-theory of noncommutative Bieberbach manifolds
  We compute $K-theory of noncommutative Bieberbach manifolds, which quotients of a three-dimensional noncommutative torus by a free action of a cyclic group Z_N, N=2,3,4,6. 
Piotr Olczykowski and Andrzej Sitarz
math.QA math-ph math.KT math.MP math.OA