Dhompongsa, S.; Kumam, P. (2021). "A Remark on the Caristi's Fixed Point Theorem and the Brouwer Fixed Point Theorem". In Kreinovich, V. (ed.). Statistical and Fuzzy Approaches to Data Processing, with Applications to Econometrics and Other Areas. Berlin: Springer. pp. 93–99. doi:10.1007/978-3-030-45619-1_7. ISBN978-3-030-45618-4.