Lapierre, C., B. Monties, D. Meier, et al. "Structural Investigation of Kraft Lignins Transformed via Oxo-Ammoniation to Potential Nitrogenous Fertilizers" Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood, 48.s1 (2009): 63-68. Retrieved 18 May. 2013, from doi:10.1515/hfsg.1994.48.s1.63

Lapierre, C., Monties, B., Meier, D., et al. (2009). Structural Investigation of Kraft Lignins Transformed via Oxo-Ammoniation to Potential Nitrogenous Fertilizers. Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood, 48(s1), pp. 3-158. Retrieved 18 May. 2013, from doi:10.1515/hfsg.1994.48.s1.63

Lapierre, C., B. Monties, D. Meier, et al. 2009. Structural Investigation of Kraft Lignins Transformed via Oxo-Ammoniation to Potential Nitrogenous Fertilizers. Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood. 48(s1): 3-158. Retrieved 18 May. 2013, from doi:10.1515/hfsg.1994.48.s1.63