Kapłonek, W., M. Sutowska, M. Ungureanu, and K. Çetinkaya. “Optical Profilometer With Confocal Chromatic Sensor for High-Accuracy 3D Measurements of the Uncirculated and Circulated Coins”. Journal of Mechanical and Energy Engineering, Vol. 2, no. 3, Dec. 2018, pp. 181-92, doi:10.30464/jmee.2018.2.3.181.