1. Hanna V., Juha K., Mika H., Lassi L. // Записки Горного института. 2008. Том 174. C. 113-115.

1. Hanna V., Juha K., Mika H., Lassi L. Reduction of greenhouse gas emissions in the district heating system of Vyborg // Journal of Mining Institute. 2008. Том 174. C. 113-115.