1. A Late Permian flora with Dicrodium from the Dead Sea Region, Jordan;Abu Hamad;Review of Palaeobotany and Palynology,2008
2. Palaeoenvironments of coal seams deposition in Candiota Coalfield, South Brazil, based on maceral composition, Faculdade de Sciências do Porto, vol. 5;Ade,1998
3. Étude pétrographie du bassin houiller malgache;Alpern;Annales de la Société Géologique du Nord (Lille),1972
4. Composition pétrographique des charbons humiques de U.R.S.S.;Ammosov,1964
5. Annon., 1983. Investigations of coal samples taken under the Moatize (II) exploration Programme to evaluate their material composition, raw material and coking properties for characterisation of the examined deposit areas. Brennstoffinstitut Freiberg-DDR, November 1983, unpublished report.