Studia - Gerhards, Albert, <1951- >. (OLS)http://semarc/name/6580; Klöckener, Martin, <1955- >. (OLS)http://semarc/name/89620; Brakmann, Heinzgerd. (OLS)http://semarc/name/6581 (Prex eucharistica, 2005)