no. 1
On the approximability of the logarithms of algebraic numbers
Séminaire Delange-Pisot-Poitou. Théorie des nombres, Tome 16 (1974-1975) no. 1, Exposé no. 19, 6 p. 
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Cijsouw, Pieter L. On the approximability of the logarithms of algebraic numbers. Séminaire Delange-Pisot-Poitou. Théorie des nombres, Tome 16 (1974-1975) no. 1, Exposé no. 19, 6 p. http://www.numdam.org/item/SDPP_1974-1975__16_1_A14_0/

[1] Cijsouw (P.L.). - Transcendence measures, Thesis, Amsterdam 1972. | MR | Zbl

[2] Cijsouw (P.L.). - Transcendence measures of exponentials and logarithms of algebraic numbers, Compositio Math., Groningen, t. 28, 1974, p. 163-178. | Numdam | MR | Zbl

[3] Cijsouw (P.L.). - On the simultaneous approximation of certain numbers, Duke math. J., t. 42, 1975, p. 249-257. | MR | Zbl

[4] Fel'Dman (N.L.). - The approximation of certain transcendental numbers, I : The approximation of logarithms of algebraic numbers, Amer. math. Soc. Transl., Series 2, t. 59, 1966, p. 224-245 ; | Zbl

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[5] Fel'Dman (N.L.). - The approximation of the logarithms of algebraic numbers by algebraic numbers, Amer. math. Soc. Transl., Series 2, t. 58, 1966, p. 125-142 ; | Zbl

[in Russian] Izv. Akad. Nauk SSSR, Ser. mat., t. 24, 1960, p. 475- 492. | MR