E85  Solutio problematis catoptrici in his actis A. 1745 Mense Septembri P. I pag. 523 propositi
(Solution to a catoptric problem proposed in this journal in September 1745 on page 523)
Summary:
According to Eneström, this work is "about the problem from 1745" (E79).
Publication:

Originally published in Nova acta eruditorum, 1746, pp. 230233

Opera Omnia: Series 1, Volume 27, pp. 74  77
According to P.H. Fuss, a detailed treatise
on this subject can be found in Euler’s papers which appears to be the first outline of the solution
(Commentat. arithm. 1, p. XII). Also see 1748 (E106) and 1843 (E787).
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