The first of four treatises (1797) was originally published in Helmstädt, 1799, as an inaugural dissertation; the second (1815) and third (1816) appeared in the Commentationes recentiores of the K. Gesellschaft der wissenschaften zu Göttingen, III, 1816; the fourth (1849) was published in the Abhandlungen of the same society, IV, 1850
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