PIOTRZKOWSKA H, LITNIEWSKI J, LEWANDOWSKI M, SZYMAŃSKA E, NOWICKI A. Use of Quantitative Ultrasound to Measure Acoustic Properties of Human Skin. Arch. Acoust. 2014;34(4):471-480. Accessed January 17, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/589