5Saurat JH. Retinoids and psoriasis: novel issues in retinoid pharmacology and implications for psoriasis treatment. J Am Acad Dermatol 1999;41:2-6.
6Lebwohl M, Menter A, Koo J, et al. Combination therapy to treat moderate to severe psoriasis. J Am Acad Dermatol 2004;50:416-430.
7Rim JH, Park JY, Choe YB, et al. The etticacy of calcipotriol + acitretin combination therapy for psoriasis: comparison with acitretin monotherapy. Am J Clin Dermatol 2003;4: 507-510.