Romana ecclesia cathedra Petri - Maccarrone, Michele. (OLS)http://ftis/name/51289; Galuzzi, Alessandro. (OLS)http://ftis/name/55171; Volpini, Raffaello. (OLS)http://ftis/name/55170; Zerbi, Piero. (OLS)http://ftis/name/53986 (Herder,, 1991)