Backward parabolic equations
Analytic solutions of partial differential equations - Trento, 1981, Astérisque, no. 89-90 (1981), pp. 213-221. 
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     author = {Lousberg, P.},
     title = {Backward parabolic equations},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
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     number = {89-90},
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     url = {http://archive.numdam.org/item/AST_1981__89-90__213_0/}
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Lousberg, P. Backward parabolic equations, in Analytic solutions of partial differential equations - Trento, 1981, Astérisque, no. 89-90 (1981), pp. 213-221. http://archive.numdam.org/item/AST_1981__89-90__213_0/

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[4] M. Taylor, Reflection of singularities of solutions to systems of differential equations, Comm. Pure Appl. Math., 28 (1975), pp. 457-478. | DOI | MR | Zbl