1. Bachmann, S., Bols, A., De Roeck, W., Fraas, M.: Quantization of conductance in gapped interacting systems. Ann. Henri Poincaré 19(3), 695–708 (2018)
2. Bachmann, S., Bols, A., De Roeck, W., Fraas, M.: A many-body index for quantum charge transport. Commun. Math. Phys. 375(2), 1249–1272 (2019)
3. Bachmann, S., De Roeck, W., Fraas, M., Jappens, T.: A classification of $$G$$-charge Thouless pumps in 1D invertible states. arXiv:2204.03763 (2022)
4. Berry, M.V.: Quantal phase factors accompanying adiabatic changes. Proc. R. Soc. Lond. Ser. A 392, 45–57 (1984)
5. Bratteli, O., Robinson, D.W.: Operator algebras and quantum statistical mechanics. 1.$$C^\ast $$- and $$W^\ast $$-algebras, symmetry groups, decomposition of states. In: Texts and Monographs in Physics, 2nd edn. Springer-Verlag, New York (1987)