1. Hydroxamic acids as collectors in the flotation of wolframite, cassiterite and pyrochlore;Bogdanov,1973
2. Flotation Kinetics;Ek,1991
3. Selection of Chemical Reagents for Flotation;Klimpel,1980
4. Araxá Niobium Mine;Paraíso;Mining Magazine,1982
5. Pyrochlore Analytical Profile;Pena,1989