Lacerda, Roseli Sengling, et al. “Lignin Concentration in Oat (Avena Byzantina L.) Aerial Part As Measured by Four Analytical Methods”. Brazilian Journal of Veterinary Research and Animal Science, vol. 43, no. 3, June 2006, pp. 400-7, https://doi.org/10.11606/issn.1678-4456.bjvras.2006.26489.