Becidan M., Todorovic D., Skreiberg T., Khalil R.A., Backman R., Goile F., Skreiberg A., Jovovic A., Sørum L. Ash related behaviour in staged and non-staged combustion of biomass fuels and fuel mixtures. 2012. Biomass and Bioenergy. 41. 86-93. 10.1016/j.biombioe.2012.02.005.