1.
KosiƄski W, Saxton K, Saxton R. Second sound speed in a crystal of NaF at low temperature. Arch. Mech. [Internet]. 1997 Feb. 28 [cited 2026 Mar. 4];49(1):189-96. Available from: http://am.ippt.gov.pl/index.php/am/article/view/v49p189