Density and stability of Morse functions on a stratified space
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 4, pp. 593-608. 
@article{ASNSP_1979_4_6_4_593_0,
     author = {Pignoni, Roberto},
     title = {Density and stability of {Morse} functions on a stratified space},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {593--608},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 6},
     number = {4},
     year = {1979},
     mrnumber = {563336},
     zbl = {0432.58003},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1979_4_6_4_593_0/}
}
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Pignoni, Roberto. Density and stability of Morse functions on a stratified space. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 4, pp. 593-608. http://www.numdam.org/item/ASNSP_1979_4_6_4_593_0/

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