MONATSHEFTE FUR MATHEMATIK, cilt.177, sa.2, ss.275-293, 2015 (SCI-Expanded, Scopus)
We define an order relation among oriented -complexes. We show that with respect to this relation, two -complexes over the same complex are homotopy equivalent if and only if there is an isometry between the second homology groups. We also consider minimal objects of this relation.