Wu, Fengong A generalization of Caristi’s fixed point theorem in sequentially complete local convex space and its application. (Chinese. English summary) Zbl 1150.54363 J. Guangdong Educ. Inst. 27, No. 5, 40-42 (2007). MSC: 54H25 54D55 PDFBibTeX XMLCite \textit{F. Wu}, J. Guangdong Educ. Inst. 27, No. 5, 40--42 (2007; Zbl 1150.54363)
Lin, Lai-Jiu; Du, Wei-Shih Some equivalent formulations of the generalized Ekeland’s variational principle and their applications. (English) Zbl 1111.49013 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 67, No. 1, 187-199 (2007). MSC: 49J53 49J27 PDFBibTeX XMLCite \textit{L.-J. Lin} and \textit{W.-S. Du}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 67, No. 1, 187--199 (2007; Zbl 1111.49013) Full Text: DOI