Xiaoli Ling Dai, Y., Fang, S.-C., Ling, X., & Nuttle, H. L. W. (2008, June). Risk pooling strategy in a multi-echelon supply chain with price-sensitive demand. MATHEMATICAL METHODS OF OPERATIONS RESEARCH, Vol. 67, pp. 391–421. https://doi.org/10.1007/s00186-007-0203-8