Brumm, P., E. Dörsam, D. L. Nguyen, and M. Schmitt-Lewen. “Quality Control of Embossed Holograms by Measuring Gloss and Color Values”. Journal of Print and Media Technology Research, vol. 6, no. 1, June 2023, pp. 7-18, http://jpmtr.net/index.php/journal/article/view/90.