1. U. Abraham, A note on Dilworth’s theorem in the infinite case, Order 4 (1987), 107–125.
2. R. Aharoni, König’s duality theorem for infinite bipartite graphs, J. London Math. Soc. (2) 29 (1984), 1–12.
3. M. Bell and J. Ginsburg, Compact spaces and spaces of maximal complete subgraphs, Trans. Amer. Math. Soc. 283 (1984), 329–338.
4. N.G. de Bruijn and P. Erdös, A colour problem for infinite graphs and a problem in the theory of relations, Indag. Math. 13 (1951), 369–373.
5. A. Church, “Introduction to Mathematical Logic,” Vol. 1, Princeton Univ. Press, Princeton, New Jersey, 1956.