1. Use of ultrasound during the beneficiation of titanium-zirconium alluvial deposits;Akopova;Tsvetn. Metall.,1970
2. Der Ultraschall und seine Anwendung in Wissenschaft und Technik;Bergmann,1954
3. Acoustic investigations of the selective flotation of minerals;Bershitskii;Tsvetn. Metall.,1977
4. Effect of ultrasonic pretreatment on flotation and electrokinetic properties of coal;Celik;Colloid Surf.,1980
5. Floatability and electrokinetic properties of fluorite and barite;Dobias;Erzmetall,1968