1. Hanna , V., Juha , K., Mika , H., Lassi , L.: Записки Горного института. 174, 113-115 (2008)

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. 174, 113-115 (2008)