1. Agar , G. E. , 1984 , “Scheelite flotation process.” Patent specification 4488959, USA, 17 p.
2. Hallimond tube flotation of scheelite and calcite with amines
3. Bahr , A. and Koser , H. , 1975 , “Selective depression of silicates in scheelite flotation with fatty acids.”Proceedings of 11th International Mineral Processing Congress, Rome, pp. 691–712
4. Geochemistry of tungsten