1. Aid in Correlating Soft and Hard Structures of Face and Transposing Frankfort Horizontal Plane to Radiograph;Maxian;Internat. J. Orthodontia,1938
2. Bedeutung und Auswertung des Fernröntgenbildes in der Kieferorthopädie (Hofrath’s Method of Reducing to Bring Out the Soft Tissues);Korkhaus;Fortschr. a. d. geb. d. Röntgenstrahlen (Kongresshft.),1937
3. Richardson, J. W.: Personal communication to the author.