1. A. Pashnev and F. Toppan, On the Classification of N-Extended Supersymmetric Quantum Mechanical Systems, CBPF, JINR preprint, CBPF-NF-029/00, JINR E2-2000-193, hep-th/0010135, Dubna, Rio de Janeiro, 2000.
2. M. De Crombrugghe and V. Rittenberg, Ann. of Phys. 151 (1983), 99.
3. M. Claudson and M.B. Halpern, Nucl.Phys. B250 (1985), 689.
4. B. de Wit, A.K. Tollsten and H. Nicolai, Nucl.Phys. B392 (1993), 3.
5. S. James Gates, Jr. and Lubna Rana, Phys. Lett. B352 (1995), 50; ibid. B369 (1996), 262.