References
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- The author gratefully acknowledges materials supplied by G. Trapani of Polariod Corp
- Hartshorn , N. H. and Stuart , A. 1970 . Crystals and the Polarizing Microscope , 4th Edition , 246 London : Edward Arnold .
- Bigelow , J. E. , Castleberry , D. e. and Stein , C. R. 62 SID '77 Digest