Transcendence measures of exponentials and logarithms of algebraic numbers
Compositio Mathematica, Tome 28 (1974) no. 2, pp. 163-178. 
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     title = {Transcendence measures of exponentials and logarithms of algebraic numbers},
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     number = {2},
     year = {1974},
     mrnumber = {347744},
     zbl = {0284.10013},
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     url = {http://www.numdam.org/item/CM_1974__28_2_163_0/}
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Cijsouw, P. L. Transcendence measures of exponentials and logarithms of algebraic numbers. Compositio Mathematica, Tome 28 (1974) no. 2, pp. 163-178. http://www.numdam.org/item/CM_1974__28_2_163_0/

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