1. Olombel A., Perebaskine C. and Raggenbass A. French patent P.V. No. 21,959, No. 1,478,339 (1967), and P.V. No. 21,960, No. 1,478,340 (1967).
2. Langiet G. CEA-R-3853 (BNWL-tr-65, 1971).
3. Processing of Radioactive Waste Solution with Zeolites, (I)