1. Personal communication with H. F. Kurtz, Aluminum Specialist, U.S. Bureau of Mines, Columbia Plaza, 2401 E St., N.W., Washington, D.C. 20241, January 1980.
2. Evaluation of Technology for the Recovery of Metallurgical-Grade Alumina From Coal Ash;Eisele,1979
3. The Fly Ash Route to Metals Will Get a Pilot Test;Eisele;Chemical Week,1980
4. Fly Ash From Coal Fired Plants Used to Make Portland Cement;Eisele;Mining Engineering,1980
5. Recovery of Alumina From a Mixture of Ekibastuz Coal Waste and Bauxite;Eremin;Khim. Pererab. Topl.,1977