Fortier's accusations: A reply. - Christopher S. Butler (Comput. Humanit., 1989)

Maximum a posteriori estimation for SPECT using regularization techniques on massively parallel computers. - Christopher S. Butler; Michael I. Miller (IEEE Trans. Medical Imaging, 1993)

3-D maximum a posteriori estimation for single photon emission computed tomography on massively-parallel computers. - Michael I. Miller; Christopher S. Butler (IEEE Trans. Medical Imaging, 1993)