8J. Smith, J. Speakes, and M. H. Rashid, "An overview of the modern light dimmer: design, operation, and application," IEEE Power Symposium, Proceedings of the 37th Annual North American, Oct. 2005, pp. 299 -303.
9Winslow R. Briggs, Margaret A. Olney. Photorec-eptors in Plant Photomorphogenesis to Data. Five Ph-ytochromes, Two Cryptochromes, One Phototropin a-nd One Superchrome. Plant Physiology, January2001, Vol. 125, pp. 85 - 88.