P. Massami, E.; M. Manyas, M.; M. Myamba, B. Grey Theory Based Evaluation of importers’ Strategies for Hedging the Price Risk in the Tanzanian Oil Supply Chain: A Focus on Derivative Products. IJAMR 2018, 7 (3), 62-68. https://doi.org/10.14419/ijamr.v7i3.12196.