- Decomposition and sulphation of calcareous compounds during combustion of Estonian oil shaleTrikkel, Andres; Kuusik, Rein, keemik; Uibu, MaiSixth International Symposium & Exhibition on Environmental Contamination in Central and Eastern Europe and the Commonwealth of Independent States : 1-4 September 2003, Prague, Czech Republic : symposium program2003 / p. 192