1. Abel EA (1992) Photochemotherapy in Dermatology. Igaku-Shoin Medical Publishers, New York
2. Frappaz A, Thivolet J (1993) Calcipotriol in combination with PUVA: A randomized double-blind placebo study in severe psoriasis. Eur J Dermatol 3: 351–354
3. Gonzalez E (1995) PUVA for psoriasis. Dermatol Clinic 13: (4), 851–866
4. Gupta AK, Andeson TF (1987) Psoralen photochemotherapy. J Am Acad Dermatol 17: 703–734
5. Harber LC, Bickers DR (1989) Photosensitivity Diseases. Saunders, Philadelphia