Fretheim, Torun. “Structural Breaks or Continuous Adjustments in Grain Production and Prices 1961-2014? An Explorative Study”. Applied Studies in Agribusiness and Commerce 12, no. 1-2 (May 2, 2018): 11-22. Accessed October 29, 2020. https://ojs.lib.unideb.hu/apstract/article/view/5157.