Kiselev, S.I., Khmelenko, V.V. і Lee, D.M. 2000. Sound propagation in liquid He in impurity-helium solids: Low-Temperature Physics and Chemistry in Cryomatrice. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР. 26, 9-10 (Вер 2000), 874–883. DOI:https://doi.org/10.1063/1.1312389.