Sign-changing and extremal constant-sign solutions of nonlinear elliptic Neumann boundary value problems. Winkert, Patrick — 2010 Boundary Value Problems [electronic only]
Discontinuous variational-hemivariational inequalities involving the p -Laplacian. Winkert, Patrick — 2007 Journal of Inequalities and Applications [electronic only]
General comparison principle for variational-hemivariational inequalities. Carl, Siegfried; Winkert, Patrick — 2009 Journal of Inequalities and Applications [electronic only]