1. Interpretation of electron diffraction patterns;Andrews,1967
2. Crystallographic data for the tetragonal crystal system;Frounfelker;Trans. A.I.M.E.,1962
3. Crystallographic data for the hexagonal crystal system;Frounfelker;Nucl. Sci. and Engin.,1962
4. Interplanar angles in the cubic, tetragonal and hexagonal systems;Hogan,1970