1. Organic maturation of sedimentary organic matter and petroleum exploration: a review;Brooks,1981
2. Some remarkable Antarctic coals;Brown;Fuel,1961
3. Reflectance of thermally metamorphosed coals;Chandra;Fuel,1963
4. Die Bedeutung der Graptolithenfragmente in Paläozoikum von Soest - Erwitte für Stratigraphie und Inkohlung;Clausen;Fortschrite Geologie Rheinland und Westfalen,1982
5. A British meta-anthracitic coal of Devonian age;Cook;Geological J.,1972