1. Research Reports and Test Items Pertaining to Eye Protection of Air Crew Personnel;Fox,1961
2. Photochromic compound and composition containing the same;Ono,1971
3. Photochromic compound;Ono,1971
4. N.Y.C. Chu and R.J. Hovey, unpublished results.
5. Photochromic compounds;Hovey,1980