1) Tagami H: Impedance measurement for evaluation of the hydration state of skin surface; in Cutaneous Investigation in Health and Disease (Leveque JL ed), Marcel Dekker Inc, New York, 1989, 79-111.
2) Barel AO, Clarys P: Measurement of epidermal capacitance; in Handbook of NON-INVASIVE METHODS and the SKIN (Serup J, Jemec GBE ed). CRC Press, Boca Raton, 1995, 165-170.