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Wills, J. M.,Zur simultanen homogenen diophantischen Approximation I, Monatsh. Math.72, 254–263 (1968).
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Cusick, T.W. View-obstruction problems. Aeq. Math. 9, 165–170 (1973). https://doi.org/10.1007/BF01832623
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DOI: https://doi.org/10.1007/BF01832623