1. The dynamic range of digital radiographic systems: dose reduction or risk of overexposure?;Berkhout;Dentomaxillofac Radiol,2004
2. Image processing and enhancement provided by commercial dental software programs;Lehmann;Dentomaxillofac Radiol,2002
3. Effects of different exposure values on diagnostic accuracy of digital images;Pfeiffer;Quintessence Int,2000
4. Planigrafie en subtractie;Ziedses des Plantes,1934
5. X-ray image subtraction as a basis for assessment of periodontal changes;Webber;J Periodontal Res,1982