1. Barth, T. F. W.: Zonal structure in feldspars of crystalline schists. Tercera Reunion Int. Sobre React. de los sóolidos, Madrid, Sec.3, 263?371 (1956).
2. Bowex, N. L., andO. F. Tuttle: The system NaAlSi308-KalSi308-H20. J. Geology58, 489?511 (1950).
3. Burke, J. E.: The migration of grain boundaries: in ?Atom Movements?. Amer. Soc. Metals, 204?232 (1951).
4. De Sitter, L. U.: Structural geology, p. 552. New York: McGraw-Hill 1956.
5. Gilluly, James: The Ajo mining district, Arizona. U.S. Geol. Survey209, 112 (1946).