References
- SchaperoM.,ClineD. and HofstetterH.W. (Editors), Dictionary of Visual Science, 2nd Edition, Chilton Book Company, Philadelphia, Pa., 1968.
- CoganD. G. and KinseyV.E. “Action spectrum of keratitis produced by ultraviolet radiation”, Arch. Opthalmol., Vol. 35, 1946, p. 670.