Bifurcations of gradient vectorfields
Bifurcation, théorie ergodique et applications - 22-26 juin 1981, Astérisque, no. 98-99 (1982), pp. 39-73. 
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     author = {Vegter, Gert},
     title = {Bifurcations of gradient vectorfields},
     booktitle = {Bifurcation, th\'eorie ergodique et applications - 22-26 juin 1981},
     series = {Ast\'erisque},
     pages = {39--73},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {98-99},
     year = {1982},
     mrnumber = {724443},
     zbl = {0526.58034},
     language = {en},
     url = {http://www.numdam.org/item/AST_1983__98-99__39_0/}
}
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Vegter, Gert. Bifurcations of gradient vectorfields, dans Bifurcation, théorie ergodique et applications - 22-26 juin 1981, Astérisque, no. 98-99 (1982), pp. 39-73. http://www.numdam.org/item/AST_1983__98-99__39_0/

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