Liber 4, Tractatus 3 - Ulrich : von Strassburg, <1225-1277>. (OLS)http://semarc/name/573; Palazzo, Alessandro, <1975- >. (OLS)http://semarc/name/58134; Sturlese, Loris, <1948- >. (OLS)http://semarc/name/137 (De summo bono, 2005)