Hamiltonian Necessary Conditions for a Multiobjective Optimal Control Problem with Endpoint Constraints. - Qiji J. Zhu (SIAM J. Control. Optim., 2000)

Necessary Conditions for Constrained Optimization Problems in Smooth Banach Spaces and Applications. - Qiji J. Zhu (SIAM J. Optim., 2002)

Multiobjective optimization problem with variational inequality constraints. - Jane J. Ye; Qiji J. Zhu (Math. Program., 2003)

An Extended Extremal Principle with Applications to Multiobjective Optimization. - Boris S. Mordukhovich; Jay S. Treiman; Qiji J. Zhu (SIAM J. Optim., 2003)

Variational Methods in Convex Analysis. - Jonathan M. Borwein; Qiji J. Zhu (J. Glob. Optim., 2006)

A Variational Approach to Lagrange Multipliers. - Jonathan M. Borwein; Qiji J. Zhu (J. Optim. Theory Appl., 2016)