1. 1) Cosmetic Science and Technology: Theoretical Principles and Applications (Sakamoto, K.; Lochhead, R.Y.; Maibach, H. eds.). Elsevier, Amsterdam, Chapter 4 (2017).
2. 2) Honda, H.; Imayama, S.; Tanemura, M. A fractal-like structure in the skin. Fractals 4, 139-147 (1996).
3. 3) Maeno, T.; Kobayasshi, K.; Yamazaki, N. Relationship between the structure of human finger tissue and the location of tactile receptors. JSME Int. C 41, 94-100 (1998).
4. 4) Caspers, P.J.; Lucassen, G.W.; Carter, E.A.; Bruining, H.A.; Puppel, G.J. In vivo confocal Raman microspectroscopy of the skin: Noninvasive determination of molecular concentration profiles. J. Invest. Dermatol. 166, 434-442 (2001).
5. 5) Comaish, S.; Bottoms, E. The skin and friction: deviations from Amonton’s laws, and the effects of hydration and lubrication. Br. J. Daramatol. 84, 37-43 (1971).