1. J. W. Walker, “Isotone relations and the fixed point property for posets,” Discrete Math. 48(2-3), 275–288 (1984).
2. D. A. Podoprikhin and T. N. Fomenko, “Preservation of the existence of fixed and coincidence points under homotopy of mappings of ordered sets,” Dokl. Ross. Akad. Nauk 477(4), 402–405 (2017) [Dokl. Math. 96 (3), 591–593 (2017)].
3. R. E. Stong, “Finite topological spaces,” Trans. Amer. Math. Soc. 123(2), 325–340 (1966).
4. M. Frigon, “On continuation methods for contractive and nonexpansive mappings,” in Recent Advances on Metric Fixed Point Theory, Ciencias (Univ. Sevilla, Sevilla, 1996), Vol. 48, pp. 19–30.
5. T. N. Fomenko and D. A. Podoprikhin, “Common fixed points and coincidences of mapping families on partially ordered set,” Topology Appl. 221, 275–285 (2017).