1. Report No. 014, presented by the Soviet Delegation to the International Symposium on the Processing of Low-Grade Uranium Ore [in Russian], Vienna, June 27?July 1 (1966).
2. L. I. Kalabin, Gornyi Zhurnal, No. 1, 39 (1967).
3. G. N. Popov et al., Characteristics of the Working of Deposits of Radioactive Ores [in Russian], Atomizdat, Moscow (1964).
4. I. P. Kirichenko, Chemical Methods of Winning Minerals [in Russian], Izd. Akad. Nauk SSSR, Moscow (1958).
5. M. I. Agoshkov, The Working of Ore Deposits [in Russian], Metallurgizdat, Moscow (1954).