Weak Sharp Minima: Characterizations and Sufficient ConditionsStudniarski, Marcin; Ward, Doug E. · SIAM Journal on Control and Optimization · 1999

Mean value theorems and sufficient optimality conditions for nonsmooth functionsMarcin Studniarski · 1985

Characterizations of strict local minima for some nonlinear programming problemsMarcin Studniarski · 1997

Approximating Clarke’s subgradients of semismooth functions by divided differencesMarcin Studniarski; El Desouky Rahmo · Numerical Algorithms · 2006

Higher-order necessary optimality conditions in terms of Neustadt derivativesMarcin Studniarski · 2001

A Locally Convex Extremal Problem over Some Family of Complex FunctionsJózef Baranowicz; Marcin Studniarski · 1990

Necessary and Sufficient Conditions for Isolated Local Minima of Nonsmooth FunctionsStudniarski, Marcin · SIAM Journal on Control and Optimization · 1986