Frenette, Benoît, and Valentina Lucea. “Relative Usefulness of the Bayer Ratio As an Indicator of the Hardness of Different Coatings”. Canadian Journal of Optometry 72, no. 6 (December 1, 2010): 16. Accessed January 21, 2026. https://openjournals.uwaterloo.ca/index.php/cjo/article/view/606.