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Graham Higman, Ordering by divisibility in abstract algebras, Proc. London Math. Soc. vol. 2 (1952) pp. 326-336. MR 0049867 (14:238e)

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Joseph Kruskal, Well-partial-order and Rado's conjecture, submitted to the Proc. London Math. Soc.

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-, The theory of well-partially-ordered sets, June, 1954, Princeton University, doctoral thesis.

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B. H. Neumann, On ordered division rings, Trans. Amer. Math. Soc. vol. 66 (1949) pp. 202-346. MR 0032593 (11:311f)

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Richard Rado, Partial well-ordering of sets of vectors, Mathematika vol. 1 (1954) pp. 89-95. MR 0066441 (16:576b)