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W. G. Leavitt, Finite dimensional modules, Anais da Academia Brasileira de Ciências, Rio de Janeiro, vol. 27 (1955) pp. 241-250. MR 0074397 (17:578a)

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Oystein Ore, Linear equations in non-commutative fields, Ann. of Math. vol. 32 (1931) pp. 463-477. MR 1503010

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A. Malcev, On the immersion of an algebraic ring into a field, Math. Ann. vol. 113 (1937) pp. 686-691. MR 1513116

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J. C. Shepherdson, Inverses and zero divisors in matrix rings, Proc. London Math. Soc. (3) vol. 1 (1941) pp. 71-85. MR 0041831 (13:7i)