1: Prolegomena ad Gerardi Magni Opera Omnia - Van Dijk, Rudolf Th. M. (OLS)http://ftis/name/69955; Groote, Geert. (OLS)http://ftis/name/52558; Hofman, Rijcklof. (OLS)http://ftis/name/69956 (Gerardi Magni Opera Omnia, 2003)