Citation: Ea. Knudsen et al., ULTRAVIOLET A-INDUCED PHOTODEGRADATION OF 5-METHOXYPSORALEN, 8-METHOXYPSORALEN AND PSORALEN REDUCES THE BIOLOGICAL EFFECTIVENESS OF THE FUROCOUMARINS IN-VIVO, Photodermatology, photoimmunology & photomedicine, 11(3), 1995, pp. 131-133