E. C. Milner, N. Sauer Remarks on the cofinality of a partially ordered set, and a generalization of König's lemma. [Citation Graph (0, 0)][DBLP] Discrete Mathematics, 1981, v:35, n:1-3, pp:165-171 [Journal]

András Hajnal, N. Sauer Complete subgraphs of infinite multipartite graphs and antichains in partially ordered sets. [Citation Graph (0, 0)][DBLP] Discrete Mathematics, 1986, v:59, n:1-2, pp:61-67 [Journal]