[1] S. Abian, A. B. Bгown: A theorem on partially ordered sets with applications to fixed point theorems. Canad. J. Math. 13 (1961), 78-83. MR 0123492

[2] N. Bouгbaki: Theorie des Ensembles. Paris, 1956.

[3] P. Crawley, R. P. Dilworth: Algebraic Theory of Lattices. Prentice-Hall., Englewood Cliffs, NJ, 1973. Zbl 0494.06001

[4] А. C. Davis: A characterization of complete lattices. Pacific J. Math. 5 (1955), 311-319. MR 0074377 | Zbl 0064.26101

[5] G. Markowsky: Chain complete posets and directed sets with applications. Аlg. Universalis 6 (1976), 53-68. MR 0398913 | Zbl 0332.06001

[6] А. Taгski: A lattice theoretical fixpoint theorem and its applications. Pacific J. Math. 5 (1955), 285-309. MR 0074376

[7] E. Zermelo: Neuer Beweis für die Möglichkeit einer Wohlordnung. Math. Аnn. 65 (1908), 107-128.