1. K. Nassau, J. Cryst. Growth,15, 171, 1972.
2. R. Rodriguez-Clemente and S. Veintemillas-Verdaguer, European Meeting on Crystal Growth ’82. Abstracts, p. 249.
3. I. Földvári, K. Raksányi, R. Voszka, E. Hartmann and Á. Péter, J. Cryst. Growth,52, 561, 1981.
4. E. D. Kolb and R. A. Laudise, Mater. Res. Bull.,8, 1123, 1973.
5. V. I. Popolitov, A. Ya. Shapiro and A. N. Lobachev, Soviet Physics, Crystallography27, 375, 1982.