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↑BirgitB.KammBirgitB., Patrick R.P.R.GruberPatrick R.P.R., MichaelM.KammMichaelM., Biorefineries – Industrial Processes and Products, [w:] Ullmann’s Encyclopedia of Industrial Chemistry, Weinheim: Wiley‐VCH, 2005, s. 3, DOI: 10.1002/14356007.l04_l01(ang.).