Electrochemical characterization of human skin by impedance spectroscopy: The effect of penetration enhancers Kontturi, K.; Murtomäki, L.; Hirvonen, J.; Paronen, P.; Urtti, A. Pharmaceutical Research 10(3): 381-385 1993 0724-8741 10.1023/a:1018984121415 https://eurekamag.com/research/008/592/008592548.php