@book{ 0-1665811188, title = {The unpolarized two-loop massive pure singlet for deep-inelastic scattering}, series = {DESY}, author = {Blümlein, Johannes and Raab, C. G. and Schönwald, Kay}, address = {Hamburg}, publisher = {Deutsches Elektronen-Synchrotron DESY}, year = {2019}, language = {English}, url = {http://www-library.desy.de/cgi-bin/showprep.pl?DESY19-038}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1665811188} }