A. Strong

Accurate frameless registration of MR and CT images of the head: applications in planning surgery and radiation therapy.

D. Hill, D. Hawkes, D. Thomas, 1994, Radiology.

A System for Microscope-Assisted Guided Interventions

R. P. Gaston, D. Hill, D. Hawkes, 2000, Stereotactic and Functional Neurosurgery.