Z_2 orbifold compactification of heterotic string and 6D SO(16) and E_7 times SU(2) flavor unification models
Z_2 x Z_2 Heterotic Orbifold Models of Non Factorisable Six Dimensional Toroidal Manifolds
Z_2-Graded Cocycles in Higher Dimensions
Z_3 orbifolds of the SO(32) heterotic string: 1 Wilson line embeddings
Z_k String fluxes and monopole confinement in non-Abelian theories
Z_N x Z_M orientifolds with and without discrete torsion
Z_n-Graded Topological Generalizations of Supersymmetry and Orthofermion Algebra
Z_N-Invariant Subgroups of Semi-Simple Lie Groups
Z_n^3-graded colored supersymmetry