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Zlotogorski A (1987). "Distribution of skin surface pH on the forehead and cheek of adults". Arch. Dermatol. Res. 279 (6): 398–401. doi:10.1007/bf00412626. PMID3674963. S2CID3065931.
McCulley, JP; Shine, WE (March 2004). "The lipid layer of tears: dependent on meibomian gland function". Experimental Eye Research. 78 (3): 361–5. doi:10.1016/s0014-4835(03)00203-3. PMID15106913.
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Farrell LN, Strauss JS, Stranieri AM (December 1980). "The treatment of severe cystic acne with 13-cis-retinoic acid. Evaluation of sebum production and the clinical response in a multiple-dose trial". Journal of the American Academy of Dermatology. 3 (6): 602–11. doi:10.1016/S0190-9622(80)80074-0. PMID6451637.
Zlotogorski A (1987). "Distribution of skin surface pH on the forehead and cheek of adults". Arch. Dermatol. Res. 279 (6): 398–401. doi:10.1007/bf00412626. PMID3674963. S2CID3065931.