R. Chalas, I. Wojcik-Checinska, J. Zubrzycka-Wrobel, D. Piatek, and T. Bachanek, “Comparison of visual, impedance spectroscopy and laser fluorescence methods in detecting early carious lesions on occlusal surfaces”, Curr. Issues Pharm. Med. Sci., vol. 27, no. 2, pp. 102–104, Nov. 2014, doi: 10.2478/cipms-2014-0023.