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E. Hlawka, Über die Approximation von zwei komplexen inhomogenen Linearformen, Monatsh. Math. vol. 46 (1937-1938) pp. 324-334. MR 1550750

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A. Hurwitz, Über die angenäherte Darstellung der Irrationalzahlen durch rationale Brüche, Math. Ann. vol. 39 (1891) pp. 279-284. MR 1510702

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A. Khintchine, Neuer Beweis und Verallgemeinerung eines Hurwitzschen Satzes, Math. Ann. vol. 111 (1935) pp. 631-637. MR 1513020

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J. F. Koksma, Sur l'approximation des nombres irrationels sous une condition supplémentaire, Simon Stevin vol. 28 (1951) pp. 199-202. MR 0047082 (13:825e)

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L. Kuipers and B. Meulenbeld, Some properties of continued fractions, Acta Math. vol. 87 (1952) pp. 1-12. MR 0048505 (14:23d)

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K. Mahler, On the product of two complex linear polynomials in two variables, J. London Math. Soc. vol. 15 (1940) pp. 213-236. MR 0003006 (2:148e)

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Leonard Tornheim, Asymmetric minima of quadratic forms and asymmetric Diophantine approximation, Duke Math. J. vol. 22 (1955) pp. 287-294. MR 0069221 (16:1003a)