[1]V. Hanna, K. Juha, H. Mika, и L. Lassi, PMI, т. 174, сс. 113-115, мар. 2008.

[1]V. Hanna, K. Juha, H. Mika, and L. Lassi, “Reduction of greenhouse gas emissions in the district heating system of Vyborg”, PMI, vol. 174, pp. 113-115, Mar. 2008.