M. Gallas and Melvin Eisner. Fluorescence of Melanin-Dependence upon Excitation Wavelength and Concentration. Photochem. And Photobiol. May 1987, 45 (5):
band-gap energy of cubic and hexagonal boron nitride using luminescence excitation spectroscopy (PDF). Journal of Physics: Condensed Matter. 2008, 20 (7):