doublet achromatique

[1996] New Light on the Invention of the Achromatic Telescope Objective ; R. Willach ; Notes and Records 50 (1996) p. 195 [lien]
[2001] Dollond & Son's Pursuit of Achromaticity, 1758-1789 ; Richard Sorrenson ; History of Science 39 (2001) p. 31 [lien]