Dissertatio, de invenienda figura spatii illuminati, quando lumen solare per foramen datum ad superficiem planam transmittitur; quam cons. ampliss. facult. philos. Reg. Acad. Aboëns. Praeside mag. Gust. Gabr. Hällström, physices profess. reg. et ordin. atque Reg. Societ. Oecon. Fenn. membro, pro gradu philosophico publicae censurae submittit Frideric. Ephraim Bergroth, stip. Reg. Borea-Fenno. In audit. anatomico die XXIX Maji MDCCCII, horis a. m. solitis - Hällström, Gustavus Gabriel; Bergroth, Fridericus Ephraim; Bergroth, Fredrik Efraim; Frenckell, Johan Christopher II (kirjapaino, Turku, 1785-1814); Frenckell, Johan Christofer (II : Turku) (typis Frenckellianis, 1802)
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