Kudahettige-Nilsson R.L., Helmerius J., Nilsson R.T., Sjöblom M., Hodge D.B., Rova U. Biobutanol production by Clostridium acetobutylicum using xylose recovered from birch Kraft black liquor. 2015. Bioresource Technology. 176. 71-79. 10.1016/j.biortech.2014.11.012.