Borglund, E, et al. “Topical Meclocycline Sulfosalicylate, Benzoyl Peroxide, and a Combination of the Two in the Treatment of Acne Vulgaris”. Acta Dermato-Venereologica, vol. 71, no. 2, Jan. 1991, pp. 175-8, doi:10.2340/0001555571175178.