FILIPCZYŃSKI, Leszek, and Anna GRABOWSKA. 2015. “Deviation of the Acoustic Pressure to Particle Velocity Ratio from the ϱc Value in Liquids and Solids at High Pressuress”. Archives of Acoustics 14 (3-4): 173-79. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3046.