Dissertatio academica, de spiritu in genere, quam, approbante ampliss. facult. philosoph. in Reg. Acad. Aboënsi praeside maxime reverendo atque amplissimo viro, dn. mag. Carolo Mesterton, log. & metaph. profess. reg. & ord. Publico bonorum examini sistit, Fridericus Johannes Zweigberg, Satacundensis. Die 8. Maji, anni MDCCLI. Loco horisque solitis.1.1.1751