no. 4
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. 
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     author = {Pignoni, Roberto},
     title = {Density and stability of {Morse} functions on a stratified space},
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     pages = {593--608},
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     number = {4},
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     mrnumber = {563336},
     zbl = {0432.58003},
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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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