Subdifferential calculus in Asplund generated spacesMarián Fabian; Philip D. Loewen; Boris S. Mordukhovich · 2006

The Adjoint Arc in Nonsmooth OptimizationPhilip D. Loewen and R. T. Rockafellar · Transactions of the American Mathematical Society · 1991

The Proximal Subgradient Formula in Banach SpaceLoewen, Philip D. · Canadian Mathematical Bulletin · 1988

Existence Theory for a Stochastic Bolza ProblemLOEWEN, PHILIP D. · IMA Journal of Mathematical Control and Information · 1987

A mean value theorem for Fréchet subgradientsPhilip D. Loewen · 1994

On the multiplicity of Dini subgradients in separable spacesPhilip D. Loewen; Xianfu Wang · 2004

Epi-Derivatives of Integral Functionals with ApplicationsPhilip D. Loewen and Harry H. Zheng · Transactions of the American Mathematical Society · 1995