Baizakov, S., Oinarov, A., Eshimova, D. and Forrest, J. 2018. The Contract Theory: A 3-Dimensional Reflection on Commodities & Capital Conversions. Advances in Systems Science and Applications. 18, 1 (May 2018), 20-40. DOI:https://doi.org/10.25728/assa.2018.18.1.246.