Ng, P. H.; Tse, M. Y.; Lee, W. K. Observation of high-order rainbows formed by a pendant drop. Journal of the Optical Society of America B. 1998, 15 (11): 2782. Bibcode:1998JOSAB..15.2782N. doi:10.1364/JOSAB.15.002782.
Ng, P. H.; Tse, M. Y.; Lee, W. K. Observation of high-order rainbows formed by a pendant drop. Journal of the Optical Society of America B. 1998, 15 (11): 2782. Bibcode:1998JOSAB..15.2782N. doi:10.1364/JOSAB.15.002782.