We discuss some questions related to the arithmetic of algebraic groups $SL_n(D)$ where $D$ is
a central finite-dimensional division algebra over a number field.
Links:
[1] http://www.mpim-bonn.mpg.de/taxonomy/term/39
[2] http://www.mpim-bonn.mpg.de/node/3444
[3] http://www.mpim-bonn.mpg.de/node/246