1. Thorium–uranium ratios as indicators of sedimentary processes: example of concept of geochemical facies;Adams;Bulletin American Association of Petroleum Geologists,1958
2. Trace-element behaviour and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems;Algeo;Chemical Geology,2004
3. Natural radioactivity in phosphates, phosphogypsum and natural waters in Morocco;Azouazi;Journal of Environmental Radioactivity,2001
4. Bekri, O., Ziyad, M., 1991. In: Abstract Presented at Oil Shale Symposium, Lexington, Kentucky, U.S.A.
5. Benalioulhaj, N., 1991. Les formations à phosphates et à schistes bitumineux du bassin des oulad-Abdoun et du bassin de Timahdit (Maroc): pétrographie, minéralogie, géochimie et environnement de dépoˆt. Thesis. Université Louis Pasteur, Strasbourg, France.