Mawhin, J.; Schmitt, K. Upper and lower solutions and semilinear second order elliptic equations with nonlinear boundary conditions. (English) Zbl 0573.35029 Proc. R. Soc. Edinb., Sect. A 97, 199-207 (1984). Reviewer: E.Mascolo MSC: 35J65 35B05 35A05 35J25 PDFBibTeX XMLCite \textit{J. Mawhin} and \textit{K. Schmitt}, Proc. R. Soc. Edinb., Sect. A, Math. 97, 199--207 (1984; Zbl 0573.35029) Full Text: DOI
Peitgen, H. O.; Schmitt, K. Global analysis of two-parameter elliptic eigenvalue problems. (English) Zbl 0543.35039 Trans. Am. Math. Soc. 283, 57-95 (1984). Reviewer: J.Smoller MSC: 35J65 35B32 35P30 35B60 65M99 65N99 PDFBibTeX XMLCite \textit{H. O. Peitgen} and \textit{K. Schmitt}, Trans. Am. Math. Soc. 283, 57--95 (1984; Zbl 0543.35039) Full Text: DOI
Schmitt, Klaus Boundary value problems for quasilinear second order elliptic equations. (English) Zbl 0378.35022 Nonlinear Anal., Theory, Methods Appl. 2, 263-309 (1978). MSC: 35J25 34B15 35B05 PDFBibTeX XMLCite \textit{K. Schmitt}, Nonlinear Anal., Theory Methods Appl. 2, 263--309 (1978; Zbl 0378.35022) Full Text: DOI
Mawhin, J.; Schmitt, K. Rothe and Altman type coincidence theorems and applications to differential equations. (English) Zbl 0347.34028 Nonlinear Anal., Theory, Methods Appl. 1, 151-160 (1977). MSC: 34C25 47J05 PDFBibTeX XMLCite \textit{J. Mawhin} and \textit{K. Schmitt}, Nonlinear Anal., Theory Methods Appl. 1, 151--160 (1977; Zbl 0347.34028) Full Text: DOI