no. 2
On a quasi-periodic Hopf bifurcation
Annales de l'I.H.P. Analyse non linéaire, Tome 4 (1987) no. 2, pp. 115-168. 
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     author = {Braaksma, B. L. J. and Broer, H. W.},
     title = {On a quasi-periodic {Hopf} bifurcation},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {115--168},
     publisher = {Gauthier-Villars},
     volume = {4},
     number = {2},
     year = {1987},
     mrnumber = {886930},
     zbl = {0614.34043},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1987__4_2_115_0/}
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Braaksma, B. L. J.; Broer, H. W. On a quasi-periodic Hopf bifurcation. Annales de l'I.H.P. Analyse non linéaire, Tome 4 (1987) no. 2, pp. 115-168. http://archive.numdam.org/item/AIHPC_1987__4_2_115_0/

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