Generalizing the ideas of Zk-manifolds from Sullivan and the
theory of stratifolds from Kreck, we define Zk-stratifolds. We
introduce the bordism theory of Zk-stratifolds in order to
represent every homology class with Zk-coefficients. We present a
geometric interpretation of the Bockstein long exact sequence and the
Atiyah-Hirzebruch spectral sequence for Zk-bordism (k odd)