no. 3
An exponentiation theorem for unbounded derivations
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 3, pp. 215-220 
@article{AIHPA_1970__13_3_215_0,
     author = {Gille, J. F.},
     title = {An exponentiation theorem for unbounded derivations},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {215--220},
     year = {1970},
     publisher = {Gauthier-Villars},
     volume = {13},
     number = {3},
     mrnumber = {279595},
     zbl = {0204.44401},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1970__13_3_215_0/}
}
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Gille, J. F. An exponentiation theorem for unbounded derivations. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 3, pp. 215-220. https://www.numdam.org/item/AIHPA_1970__13_3_215_0/

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