no. 4
On ε-optimal controls for state constraint problems
Annales de l'I.H.P. Analyse non linéaire, Tome 17 (2000) no. 4, pp. 473-502. 
@article{AIHPC_2000__17_4_473_0,
     author = {Ishii, Hitoshi and Koike, Shigeaki},
     title = {On $\varepsilon $-optimal controls for state constraint problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {473--502},
     publisher = {Gauthier-Villars},
     volume = {17},
     number = {4},
     year = {2000},
     zbl = {0969.49019},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_2000__17_4_473_0/}
}
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PY  - 2000
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VL  - 17
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Ishii, Hitoshi; Koike, Shigeaki. On $\varepsilon $-optimal controls for state constraint problems. Annales de l'I.H.P. Analyse non linéaire, Tome 17 (2000) no. 4, pp. 473-502. http://www.numdam.org/item/AIHPC_2000__17_4_473_0/

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