1. A. Connes, Noncommutative Geometry, Academic Press, New York, 1994.
2. M.H. Freedman, in: Proceedings of the Plenary Talk at the Mathematical Challenges of the 21st Century Conference, Los Angeles, August 2000.
3. J. Fröhlich, B. Pedrini, in: A. Fokas, A. Grigorian, T. Kibble, B. Zegarlinski (Eds.), Mathematical Physics, Imperial College Press, 2000.
4. Quantized Hall conductivity in two dimensions
5. Quantized motion of three two-dimensional electrons in a strong magnetic field