1. Spectroscopic Properties of Activated Laser Crystals (II)
2. Introduction to Ceramics, Wiley, New York 1960 (p. 313).
3. Crystal Structures, Vol. I, Interscience Publishers, New York 1951.
4. l. c. (p. 120).
5. Powder Diffraction File, Amer. Soc. for Testing and Materials, Philadelphia, Pa., 1964, cards 14–260, 10–45, 46, and 6–0351.