@article{RHM_1999__5_2_249_0,
     author = {Ton-That, Tuong and Tran, Thai-Duong},
     title = {Poincar\'e's proof of the co-called {Birkhoff-Witt} theorem},
     journal = {Revue d'histoire des math\'ematiques},
     pages = {249--284},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {5},
     number = {2},
     year = {1999},
     zbl = {0958.01012},
     language = {en},
     url = {http://archive.numdam.org/item/RHM_1999__5_2_249_0/}
}