1. 1. H. W. Stelwagon , Treatise on Diseases of the Skin . Philadelphia, W. B. Saunders, 1902 , pp.948 -964 .
2. 2. D. M. Pillsbury, W. B. Shelley, and A. M. Kligman , Dermatology . Philadelphia, W. B. Saunders, 1956 , pp.804 -827 .
3. Objective evaluation of demethylchlortetracycline hydrochloride in the treatment of acne
4. The Bacteriology of Acne