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R. P. Dilworth, Bulletin of the American Mathematical Society, vol. 44 (1938), pp. 262-267.

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W. Krull, Mathematische Zeitschrift, vol. 28 (1928), pp. 481-503. MR 1544973

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O. Ore. Annals of Mathematics, (2), vol. 36 (1935), pp. 406-432. MR 1503232

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M Ward, Annals of Mathematics, (2), vol. 39 (1938), pp. 558-568. MR 1503424

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M. Ward and R. P. Dilworth, Proceedings of the National Academy of Sciences, vol. 24 (1938), pp. 162-164.

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-, these Transactions, vol. 45 (1939), pp. 335-354.