Kumar, A., and P. K. Garg. “DUALITY RESULTS FOR SECOND-ORDER MULTIOBJECTIVE PROGRAMMING PROBLEM”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), vol. 7, no. 1, Dec. 2016, pp. 117-28, https://ph03.tci-thaijo.org/index.php/jnao/article/view/2816.