Normal forms for local families and nonlocal bifurcations
Complex analytic methods in dynamical systems - IMPA, January 1992, Astérisque, no. 222 (1994), pp. 233-258 
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     author = {Ilyashenko, Yu. S.},
     title = {Normal forms for local families and nonlocal bifurcations},
     booktitle = {Complex analytic methods in dynamical systems - IMPA, January 1992},
     editor = {Camacho C. and Lins Neto A. and Moussu R. and Sad P.},
     series = {Ast\'erisque},
     pages = {233--258},
     year = {1994},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {222},
     language = {en},
     url = {https://www.numdam.org/item/AST_1994__222__233_0/}
}
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Ilyashenko, Yu. S. Normal forms for local families and nonlocal bifurcations, dans Complex analytic methods in dynamical systems - IMPA, January 1992, Astérisque, no. 222 (1994), pp. 233-258. https://www.numdam.org/item/AST_1994__222__233_0/

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