BRASIL: the Braunschweig mixed-mode-simulator for integrated circuits. - Ulrich Bretthauer; Ernst-Helmut Horneber (EURO-DAC, 1996)

Programmable spread spectrum clock generation based on successive phase selection technique. - Ruchir Saraswat; Uwe Zillmann; Supriyanto Supriyanto; Guido Droege; Ulrich Bretthauer (ISCAS, 2008)