1. Proc. IAEA Symp. on Nuclear techniques and mineral resources;Fookes,1977
2. Proc. IAEA Symp. on Nuclear techniques and mineral resources;Clayton,1977
3. 4th Int. Conf. on Nuclear methods in envir. and energy research;Sowerby,1980
4. Alpha, Beta- and gamma-ray spectroscopy;Davisson,1965