De Portis Coeli / Disserit Vt Evocationi In Illvstrem Scholam Portensem Obseqvivm Praestet XXV Novembris MDCCLI Hora Secvnda Pomeridiana Pvblice Vale Dictvrvs M. Christianvs Godofredvs Grabenervs Scholae Senatoriae Novae Vrbis Ad Dresdam Hactenvs Rector. Dresdae : Praelo Jo. Guil. Harpeteri, 1751