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Zhu, H.-C. and Charlet, J. M. and Tondeur, F. (1999) Indoor radon levels in relation to geology in southern Belgium. Il nuovo cimento C, 22 C (3-4). pp. 353-358. ISSN 1826-9885
Charlet, J. M. and Makabu, K. (1999) Radon in mining exploration of the deposits of the Shaba Copperbelt. Il nuovo cimento C, 22 C (3-4). pp. 497-502. ISSN 1826-9885