http://opticalmineralogy.blogspot.com/p/michel-levy-nomogramm.html
http://academic.brooklyn.cuny.edu/geology/powell/core_asbestos/analyze/interfer/interfer_tool.htm
https://en.wikipedia.org/wiki/Conoscopic_interference_pattern
選擇波片
http://www.teo.com.tw/prodDetail_print.asp?id=1807
