Pincushion correction techniques and their effects on calculated 3D positions and imaging geometries. - Kenneth R. Hoffmann; Yang Chen; Jacqueline Esthappan; Shiuh-Yung James Chen; John D. Carroll (Image Processing, 1996)

Determination and evaluation of 3D biplane imaging geometries without a calibration object. - Anindya Sen; Jacqueline Esthappan; Li Lan; Kok-Gee Chua; Kunio Doi; Kenneth R. Hoffmann (Image Processing, 1998)