On the simultaneous approximation of a, b and a b
Compositio Mathematica, Tome 35 (1977) no. 1, pp. 99-111. 
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Bijlsma, A. On the simultaneous approximation of $a$, $b$ and $a^b$. Compositio Mathematica, Tome 35 (1977) no. 1, pp. 99-111. http://archive.numdam.org/item/CM_1977__35_1_99_0/

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