1. Avron, J.E., Seiler, R.: Quantization of the Hall Conductance for Gerneral Multiparticle Schrödinger Hamiltonians. Phys. Rev. Lett. 54, 259–262 (1985)
2. Avron, J.E., Seiler, R., Simon, B.: Charge Deficiency, Charge Transport and Comparison of Dimensions. Com. Math. Phys. 159, 399–422 (1994)
3. Bellissard, J.: K-theory of C*-algebras in solid state physics. In: Statistical Mechanics and Field Theory: Mathematical Aspects, Lecture Notes in Physics 257, edited by T. Dorlas, M. Hugenholtz, M. Winnink, Berlin: Springer-Verlag, 1986, pp. 99–156
4. Bellissard, J.: Ordinary quantum Hall effect and non-commutative cohomology. In: Proc. of the Bad Schandau Conference on Localization, 1986, eds. P. Ziesche, W. Weller, Teubner Texte Phys. 16, Leipzig: Teubner-Verlag, 1988
5. Bellissard, J., van Elst, A., Schulz-Baldes, H.: The Non-Commutative Geometry of the Quantum Hall Effect. J. Math. Physics 35, 5373–5451 (1994)