García-González, D. L., M. Viera, N. Tena, and R. Aparicio. “Evaluation of the Methods Based on Triglycerides and Sterols for the Detection of Hazelnut Oil in Olive Oil”. Grasas Y Aceites, vol. 58, no. 4, Dec. 2007, pp. 344-50, doi:10.3989/gya.2007.v58.i4.445.