Dissertatio mathematica de methodo, ex mensuratis duobus ellipseos arcubus, axes ejus inveniendi, quam cons. ampl. fac. phil. in Regia Acad. Aboënsi, praeside mag. Joh. Henr. Lindquist, math. prof. r. [et] o. atque R. Acad. Sc. Svec. membro, pro gradu publico examini submittit Gustavus Gabriel Hällström, alumn. reg. Ostrobotniensis. In auditorio mathem. die XII Junii MDCCXCV, horis a.m. solitis.1.1.1795