-\chapterauthor{Bertil Schmidt}{Johannes Gutenberg University of Mainz}
-\chapterauthor{Hoang-Vu Dang}{Johannes Gutenberg University of Mainz}
+\chapterauthor{Bertil Schmidt and Hoang-Vu Dang}{Johannes Gutenberg University of Mainz, Germany}
+%\chapterauthor{Hoang-Vu Dang}{Johannes Gutenberg University of Mainz}
\chapter{Solving large sparse linear systems for integer factorization on GPUs}
\label{chapter19}