TY  - JOUR
T1  - On Some Optical Phenomena of Opals
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 17
SP  - 448
EP  - 453
PY  - 1868/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1868.0090
M3  - doi:10.1098/rspl.1868.0090
AU  - Crookes, W.
ER  -