1. Handbook of Semiconductor Manufacturing Technology
2. Al impurity purification in quartz grown by the hydrothermal method;Suzuki;Jpn. J. Appl. Phys.,1989
3. Characterization of natural quartz lascas for high technology industries, part II: study of density and optical micrography measurements;Hummel;Ceramica,1986
4. L. C. Diniz Filho Quartzo Cristal, Sumario Mineral, DNPM/RN-National Department of Mineral Production, 2008
5. Iota High Purity Quartz, http://www.iotaquartz.com/world.html 2011