1. ?New Method for Focusing X-Rays and Gamma-Rays?, R.K., Smither, Rev. Sci. Instrum., 44. 131?141 (Feb. 1982).
2. ?New Method for Focusing and Imaging X-Rays and Gamma-Rays with Diffraction Crystals?, R. K. Smither, Sym. on Future X-Ray Experiments, X-Rays in the 80's?, GSFC, Oct. 1981, NASA Tech. Mem. No. 83848 (Nov. 1981)
3. ?A Positron Annihilation Radiation Telescope Using Laue Diffraction in a Crystal Lens?, R. K. Smither and Peter von Ballmoos, INTEGRAL Workshop, Feb. 2?5 at Les Diablerets, Switzerland. AP supp., Vol. 92, 1994 June, 663
4. ?A Bragg Crystal Flux Concentrator for Annihilation Radiation?, R.K. Smither and N. Lund, 16th Inter. Cosmic Ray Conference, India (1983). Conference proceedings, supplement issue of AP.
5. ?Crystal Diffraction Telescope for Discrete line sources?, R.K. Smither, et. al., GRO Science Workshop, GSFC, April 1989, NASA Report, Ed, W. Neil Johnson.