Nikneshan, Sima, and Behrang Moghaddamzade. “The Perceptibility Ccurve Test Applied to CCD and Two Methods of Digitization of Dental Film-Based Radiographs”. Journal of Dental School, vol. 34, no. 1, Mar. 2019, pp. 44-50, doi:10.22037/jds.v34i1.24688.