1. Fenner C. N. American Journal of Science 4 36 : 331 (1913).
2. Friedman I. Symposium on the Synthesis of Single Crystals AAAS Meeting Boston December (1946).
3. Glasstone, S., Textbook of Physical Chemistry: 733 (1940).
4. KERR, P. F., B GEOL SOC 54 1: 1 (1934).
5. McCabe, W. L., Chemical Engineers' Handbook: 1772 (1941).