Combinatorial identities and quantum state densitiesof supersymmetric sigma models on N-folds M. C. B. Abdalla, A. A. Bytsenko and M. E. X. Guimarães Eur. Phys. J. C, 44 4 (2005) 607-612 Published online: 15 December 2005 DOI: 10.1140/epjc/s2005-02395-5