no. 2
A normal form for restricted exponential functions
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 2, pp. 217-231. 
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     author = {Degano, Pierpaolo and Gianni, Patrizia},
     title = {A normal form for restricted exponential functions},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {217--231},
     publisher = {EDP-Sciences},
     volume = {23},
     number = {2},
     year = {1989},
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     zbl = {0665.03018},
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     url = {http://archive.numdam.org/item/ITA_1989__23_2_217_0/}
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Degano, Pierpaolo; Gianni, Patrizia. A normal form for restricted exponential functions. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 2, pp. 217-231. http://archive.numdam.org/item/ITA_1989__23_2_217_0/

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