@misc{Euler_Leonhard_(1707-1783)_Dioptricae.,
 author={Euler, Leonhard (1707-1783)},
 howpublished={online},
 publisher={impensis Academiae Imperialis Scientiarum},
 language={lat},
 type={printed books 1501-1800},
 title={Dioptricae. Ps. 1-3},
 keywords={physics, optics, printed books 1501-1800},
}