Carlsson P., Wiinikka H., Marklund M., Grönberg C., Pettersson E., Lidman M., Gebart R. Experimental investigation of an industrial scale black liquor gasifier. 1. the effect of reactor operation parameters on product gas composition. 2010. Fuel. 89. 12. 4025-4034. 10.1016/j.fuel.2010.05.003.