1. Alpern, B. Some reflections on coal petrology and coal classification. 21st Newcastle Symposium on “Advances in the Study of the Sydney Basin”. April10–12. pp.27–35. Newcastle, N.S.W. Australia: Department of Geology, The University of Newcastle. (Publ. No. 273)
2. Alpern, B. and Lemos de Sousa, M. J. Project of an international scientific classification of solid fossil fuels. XI Int. Congr. Caron. Stratigr. Geol. Beijing, China.
3. A progress report on the Alpern Coal Classification