“Comparison of a Near-Infrared Reflectance Spectroscopy System and Skin Conductance Measurements for in Vivo Estimation of Skin Hydration: A Clinical Study”. Journal of Biomedical Photonics & Engineering, vol. 3, no. 1, Apr. 2017, p. 010310, https://doi.org/10.18287/JBPE17.03.010310.