@book{ 0-1725706083, title = {Two-loop operator matrix elements for massive fermionic local twist-2 operators in QED}, series = {DESY}, series = {Proceedings of science}, author = {Blümlein, Johannes and De Freitas, Abilio and Neerven, W. L. van}, address = {Zeuthen}, publisher = {Deutsches Elektronen-Synchrotron DESY}, year = {2011}, language = {English}, url = {http://www-library.desy.de/cgi-bin/showprep.pl?DESY11-227}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1725706083} }