1. Duplication of roentgenograms by the light reversal process;Henny;Am J Roentgenol,1943
2. Duplication of radiographs by solarization;Ilingworth;Br J Radiol,1946
3. Evaluation of the quality of duplicated radiographs;Thunthy;Oral Surg,1981
4. Evaluation of contrast in duplicated radiographs;Thunthy;Oral Surg,1982