1. Essai de classification des combustibles fossils solides;Alpern;Publ. Tech.,1979
2. Schistes bitumineux réserves, pétrographic valorisation;Alpern;Ind. Minér.,1979
3. Draft proposal for Universal Classifcation of solid fossil fuels;Alpern;Int. Comm. Coal. Petrol.,1981
4. The application of the Alpern-ICCP, Scientific classification of Solid Fossil Fuels to qualify Gondwana coals from different basins;Alpern,1988
5. Calculation of coking charges on the basis of petrographic characteristics of coals;Ammosov;Koks Khim.,1957