Lähetä tietue sähköpostilla: Dissertatio physica, animadversiones in theoriam et experimenta cel. Du Tour de diffractione luminis continens. Cujus partem tertiam, cons. ampliss. facult. philos. Aboens. publico examini subjiciunt Petrus Ekenvall, phil. mag. et Gustavus Bergergren, Ostrogothus. In aud. majori die XIV Decemb. MDCCCIII. horis a. m. consvetis
