1. Ahtonen S, Kallio H (1989) Identification and seasonal-variations of amino-acids in birch sap used for syrup production. Food Chem 33:125–132
2. Alén R (2000) Structure and chemical composition of wood. In: Stenius P (ed) Forest products chemistry. The Finnish Paper Engineer’s Association and Tappi, Helsinki, pp 11–57
3. American Public Health Association (APHA) (2005) Standard methods for the examination of water and wastewater. American Public Health Association, Washington
4. Datacenter Team (2014) Temperature records by month in Otaniemi area, Espoo, Finland. In: Aalto IT, Infrastructure services, Aalto University, Finland. http://outside.aalto.fi . Accessed Nov 2010
5. Duan Z, Sun R (2003) An improved model calculating CO2 solubility in pure water and aqueous NaCl solutions from 273 to 533 K and from 0 to 2000 bar. Chem Geol 193:257–271