Ma, Ruyun; Chen, Ruipeng Existence of one-signed solutions of nonlinear four-point boundary value problems. (English) Zbl 1265.34053 Czech. Math. J. 62, No. 3, 593-612 (2012). Reviewer: Milan Tvrdý (Praha) MSC: 34B10 34B15 34B18 34C23 PDFBibTeX XMLCite \textit{R. Ma} and \textit{R. Chen}, Czech. Math. J. 62, No. 3, 593--612 (2012; Zbl 1265.34053) Full Text: DOI Link
Filippucci, Roberta; Ghiselli Ricci, Roberto Non-existence of nodal and one-signed solutions for nonlinear variational equations with special symmetries. (English) Zbl 0820.34013 Arch. Ration. Mech. Anal. 127, No. 3, 281-295 (1994). Reviewer: R.Precup (Cluj-Napoca) MSC: 34B15 35J65 PDFBibTeX XMLCite \textit{R. Filippucci} and \textit{R. Ghiselli Ricci}, Arch. Ration. Mech. Anal. 127, No. 3, 281--295 (1994; Zbl 0820.34013) Full Text: DOI