Shin, Yong Hyun, Jung Lim Koo, and Kum Hwan Roh. “An Optimal Consumption and Investment Problem With Quadratic Utility and Subsistence Consumption Constraints: A Dynamic Programming Approach”. Mathematical Modelling and Analysis 23, no. 4 (October 9, 2018): 627-638. Accessed September 22, 2019. https://journals.vgtu.lt/index.php/MMA/article/view/5441.