1. M. Fujiki, 6th Int. Conf. Water Poll. Res. Paper No. 12 (1972).
2. D.E. Robertson, D.S. Sklarew, K.B. Olsen, N.S. Bloam, E.A. Crecelies, C.W. Apts, Research Project 2020-3, Final Report, Batelle Pacific Northwest Laboratories (1987).
3. L.H. Baetsle,Waste Management, 2 (1990) 907.
4. European Catalogue of Geological Formations Having Favorable Characteristics for the Disposal of Solidified High-level and Long-lived Radioactive Wastes, CEC Report EUR 6891 (1980).
5. L.H. Baetsle et al., R. Heremans et al., H. Beale et al. (Ed. by R. Simon and S. Orlowski), Harwood Academic Publishers, EUR 6871 (1980), Proc. First Eur. Conf., Luxemburg, (1980), pp. 442, 468, 488.