no. 3
Combinatorial approach to Baker-Campbell-Hausdorff exponents
Annales de l'I.H.P. Physique théorique, Tome 12 (1970) no. 3, pp. 215-254. 
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     author = {Mielnik, Bogdan and Pleba\'nski, Jerzy},
     title = {Combinatorial approach to {Baker-Campbell-Hausdorff} exponents},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {215--254},
     publisher = {Gauthier-Villars},
     volume = {12},
     number = {3},
     year = {1970},
     zbl = {0206.13602},
     mrnumber = {273922},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1970__12_3_215_0/}
}
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Mielnik, Bogdan; Plebański, Jerzy. Combinatorial approach to Baker-Campbell-Hausdorff exponents. Annales de l'I.H.P. Physique théorique, Tome 12 (1970) no. 3, pp. 215-254. http://www.numdam.org/item/AIHPA_1970__12_3_215_0/

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