Christian Pfeifer Leibniz Universität Hannover http://www.zarm.uni-bremen.de/cpfeifer Papers Quantum Energy Inequalities in Pre-Metric Electrodynamics Christopher J. Fewster, Christian Pfeifer, Daniel Siemssen September 06, 2017 open access link Phys. Rev. D 97, 025019 (2018) The Potential in General Linear Electrodynamics: Causal Structure, Propagators and Quantization Christian Pfeifer, Daniel Siemssen February 02, 2016 open access link Phys. Rev. D 93, 10, 105046 (2016)