Approximate controllability and its well-posedness for the semilinear reaction-diffusion equation with internal lumped controls
ESAIM: Control, Optimisation and Calculus of Variations, Tome 4 (1999), pp. 83-98 
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     author = {Khapalov, Alexander},
     title = {Approximate controllability and its well-posedness for the semilinear reaction-diffusion equation with internal lumped controls},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {83--98},
     year = {1999},
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     mrnumber = {1680760},
     zbl = {0926.93007},
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     url = {https://www.numdam.org/item/COCV_1999__4__83_0/}
}
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Khapalov, Alexander. Approximate controllability and its well-posedness for the semilinear reaction-diffusion equation with internal lumped controls. ESAIM: Control, Optimisation and Calculus of Variations, Tome 4 (1999), pp. 83-98. https://www.numdam.org/item/COCV_1999__4__83_0/

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