WASET
Nurmesniemi, H. , Mäkelä, M. , Pöykiö, R. , Dahl, O.. "Comparison of The Fertilizer Properties of Ash Fractions from Medium-Sized (32 MW) and Small-Sized (6 MW) Municipal District Heating Plants". World Academy of Science, Engineering and Technology, Open Science Index 51, International Journal of Chemical and Molecular Engineering (2011), 5(3), 252 - 256.