A Continuously Differentiable Exact Penalty Function for Nonlinear Programming Problems with Inequality Constraints
Gianni Di Pillo, Luigi Grippo · SIAM Journal on Control and Optimization · 1985
In this paper it is shown that, given a nonlinear programming problem with inequality constraints, it is possible to construct a continuously differentiable exact penalty function whose global or local unconstrained minimizers correspond to global or local solutions of the constrained problem.