Dissertatio Inauguralis, De Usu Practico Distinctionis Hominum In Liberos & Servos / Quam ... Præside Dn. Christiano Thomasio ... Pro Licentia, Summos in utroque jure honores & Privilegia Doctoralia legitime consequendi ... Die 30. Septembr. An. M DCC XI. ... Publico Eruditorum Examini submittit Frid. Wilh. von der Portzen, Clivia-Clivensis.