no. 4
Reinforcement problems in the calculus of variations
Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 4, pp. 273-284. 
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     author = {Acerbi, Emilio and Buttazzo, Giuseppe},
     title = {Reinforcement problems in the calculus of variations},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {273--284},
     publisher = {Gauthier-Villars},
     volume = {3},
     number = {4},
     year = {1986},
     mrnumber = {853383},
     zbl = {0607.73018},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1986__3_4_273_0/}
}
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Acerbi, Emilio; Buttazzo, Giuseppe. Reinforcement problems in the calculus of variations. Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 4, pp. 273-284. http://www.numdam.org/item/AIHPC_1986__3_4_273_0/

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