Verma, R. U. (2013) “Parametrically Sufficient Optimality Conditions for Multiobjective Fractional Subset Programming Relating to Generalized $(\eta, \rho, \theta)$-Invexity of Higher Order”, Journal of Informatics and Mathematical Sciences, 5(3), pp. 143–156. doi: 10.26713/jims.v5i3.221.