Endoscopic exploration and measurement in 3D radiological images. - Krishnan Ramaswamy; William E. Higgins (Image Processing, 1996)

Adaptive Axes-Generation Algorithm for 3D Tubular Structures. - Roderick David Swift; Krishnan Ramaswamy; William E. Higgins (ICIP (2), 1997)

Interactive dynamic navigation for virtual endoscopy. - Krishnan Ramaswamy; William E. Higgins (Comput. Biol. Medicine, 1999)