1. The Properties of Optical Glass;Lentes,1998
2. International Organization for Standardization ISO 10110, Optics and optical instruments (1997), Part 4: Inhomogeneity and striae.
3. Standard Test Method for Measurement of Glass Stress — Optical Coefficient;ASTM Standard 770-98,2008
4. SHOTT North America Inc., Technical Information TIE-26: Homogeneity of optical glass, available at http://www.us.schott.com.
5. Crystallization statistics. A new tool to evaluate glass homogeneity