Liber 1 - Ulrich : von Strassburg, <1225-1277>. (OLS)http://semarc/name/573; Mojsisch, Burkhard, <1944- >. (OLS)http://semarc/name/139; Imbach, Ruedi, <1946- >. (OLS)http://semarc/name/138; Libera, Alain : de, <1948- >. (OLS)http://semarc/name/17861 (De summo bono, 1989)