Birle, John. "An investigation of the high pressure, subsolidus phase equilibrium relations in the system Al₂O₃-GeO₂ as a model for the ultra high pressure behavior of kyanite /." Doctoral dissertation, Ohio State University, 1967. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486732330179655Chicago Manual of Style (17th edition)