The concept of "ecclesia" and "christianitas" and their relation to the idea of papal "plenotudo potestatis" from Gregory VII to Boniface VIII / Gerhart B. Ladner. - Ladner, Gerhart B. (Gerhart Burian), 1905-1993. (OLS)http://pul/name/15121 (Edizioni di Storia e Letteratura, 1983)