Akusticheskaia tekhnologiia v obogashchenii poleznykh iskopaemykh / IAmshchikov, V. S. (Valerii Sergeevich) Shulgin, A. I. (Aleksandr Ivanovich) text Moskva : "Nedra," 1987. rus Includes bibliographical references (p. 228-[230]). Ore-dressing. Rocks -- Acoustic properties.