1. IPCC Good Practice Guidance and Uncertainty Management in National Greenhouse Gas Inventories, 2000.

2. UNFCCC Guidelines on reporting and review. FCCC/CP/2002/8.

3. First National Communication of Bulgaria under UNFCCC, 1996.

4. Second National Communication of Bulgaria under UNFCCC, 1998.

5. Third National Communication of Bulgaria under UNFCCC, 2002.

6. Guidelines for balance method estimation of the pollutants emissions released in atmosphere, Sofia, 2000.

7. Revised 1996 IPCC Guidelines for National GHG Inventories. Volumes 1 - 3. IPCC/OECD Joint Programme, 1997.