Frohberg, K. <https://pure.iiasa.ac.at/view/iiasa/1887.html> & Pflug, G. <https://pure.iiasa.ac.at/view/iiasa/229.html> ORCID: https://orcid.org/0000-0001-8215-3550 <https://orcid.org/0000-0001-8215-3550>  (1985).  Modeling Agricultural Production for Policy Analysis.    In:  Identification and System Parameter Estimation.  pp. 1977-1982 York: IFAC.  ISBN 0080325424