[1]
Brøndsted, A., ‘On a lemma of Bishop and Phelps’, Pacific J. Math.
55 (1974), 335–341.
[2]
Caristi, J., ‘Fixed point theorems for mappings satisfying inwardness conditions’, Trans. Amer. Math. Soc.
215 (1976), 241–251.
[3]
Cobzas, S., ‘Fixed points in metric and generalized metric spaces’, Preprint, 2015, arXiv:1508.05173v1.
[4]
Downing, D. and Kirk, W. A., ‘A generalization of Caristi’s theorem with applications to nonlinear mapping theory’, Pacific J. Math.
69(2) (1977), 339–346.
[5]
Du, W.-S., ‘On Caristi-type mappings without semicontinuity assumptions’, J. Fixed Point Theory Appl.
17(4) (2015), 733–752.
[6]
Ekeland, I., ‘On the variational principle’, J. Math. Anal. Appl.
47 (1974), 324–353.
[7]
Gamir, G. H., ‘Solovay’s axiom and functional analysis’, in: Proceedings of the Symposium on Functional Analysis (Istanbul, 1973), Publication of the Mathematical Research Institute, Istanbul, 1 (Mathematical Research Institute, Istanbul, 1974), 57–68.
[8]
Jachymski, J. R., ‘Caristi’s fixed point theorem and selections of set-valued contractions’, J. Math. Anal. Appl.
227 (1998), 55–67.
[9]
Khamsi, M. A., ‘Remarks on Caristi’s fixed point theorem’, Nonlinear Anal.
71(2) (2009), 227–231.
[10]
Khamsi, M. A., ‘Introduction to metric fixed point theory’, in: Topics in Fixed Point Theory (eds. Almezel, S., Ansari, Q. H. and Khamsi, M. A.) (Springer, New York–Heidelberg–Dordrecht–London, 2014), 1–32.
[11]
Khamsi, M. A. and Kozlowski, W. M., Fixed Point Theory in Modular Function Spaces (Birkhauser–Springer International, Basel, 2015).
[12]
Kirk, W. A., ‘Caristi’s fixed point theorem and metric convexity’, Colloq. Math.
36 (1976), 81–86.
[13]
Kirk, W. A., ‘Metric fixed point theory: a brief retrospective’, Fixed Point Theory Appl.
2015 (2015), article 215.
[14]
Oettli, W. and Thera, M., ‘Equivalents of Ekeland’s principle’, Bull. Aust. Math. Soc.
48 (1993), 385–392.
[15]
van Rooij, A. C. M., ‘The axiom of choice in p-adic functional analysis’, in:
p-Adic Functional Analysis (Laredo, 1990), Lecture Notes in Pure and Applied Mathematics, 137 (Dekker, New York, 1992), 151–156.
