Gasparik, C., A. Tofan, B. Culic, M. Badea, and D. Dudea. “Influence of Light Source and Clinical Experience on Shade Matching”. Medicine and Pharmacy Reports, Vol. 87, no. 1, Mar. 2014, pp. 30-33, doi:10.15386/cjm.2014.8872.871.cg1at2.