Barry, A.O., W. Peng and B. Riedl. "The Effect of Lignin Content on the Cure Properties of Phenol-Formaldehyde Resin as Determined by Differential Scanning Calorimetry" Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood, 47.3 (2009): 247-252. Retrieved 25 May. 2013, from doi:10.1515/hfsg.1993.47.3.247

Barry, A., Peng, W. & Riedl, B. (2009). The Effect of Lignin Content on the Cure Properties of Phenol-Formaldehyde Resin as Determined by Differential Scanning Calorimetry. Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood, 47(3), pp. 181-270. Retrieved 25 May. 2013, from doi:10.1515/hfsg.1993.47.3.247

Barry, A.O., W. Peng and B. Riedl. 2009. The Effect of Lignin Content on the Cure Properties of Phenol-Formaldehyde Resin as Determined by Differential Scanning Calorimetry. Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood. 47(3): 181-270. Retrieved 25 May. 2013, from doi:10.1515/hfsg.1993.47.3.247