no. 3-4
Controllability, penalty and stiffness
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 25 (1997) no. 3-4, pp. 597-610. 
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     title = {Controllability, penalty and stiffness},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {597--610},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 25},
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     zbl = {1073.93507},
     language = {en},
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Lions, Jacques-Louis. Controllability, penalty and stiffness. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 25 (1997) no. 3-4, pp. 597-610. http://archive.numdam.org/item/ASNSP_1997_4_25_3-4_597_0/

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