Ebert, Johannes Felix Max Planck Institute for Mathematics, Max Planck Society;
https://bib.math.uni-bonn.de/downloads/bms/BMS-381.pdf (Any fulltext)
Ebert, J. F. (2006). Characteristic classes of spin surface bundles: applications of the Madsen-Weiss theory. PhD Thesis, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn.