Phys. Lett. B 137 (1984) 72. [91] H. Elvang, J. Polchinski, "The Quantum Hall Effect on RI", hep-th/0209104. [92] B. A. Dubrovin, S. P. Novikov and A. T. Fomenko, "Modern Geometry", Springer- Verlag, 1995. [93] E. V. Ferapontov and A. P. Veselov, "Integrable Schrodinger operators with magnetic fields: facto