1. Lower Carboniferous coal depositional environments on Spitzbergen, Svalbard;Abdullah;Organic Geochemistry,1988
2. Palaeoenvironments of coal seams deposition in Candiota Coalfield, South Brazil, based on maceral composition;Ade,1998
3. Le bassin houlier Viséen d'Agades. I: géologie, pétrographie, et physico-chemie;Alpern;Palinologia,1977
4. Étude pétrographie du bassin houiller malgache;Alpern;Annales de la Société Géologique du Nord (Lille),1972
5. Extraterrestrial cause for the Cretaceous/Tertiary extinction;Alvarez;Science,1980