The Cauchy problem and Hadamard's example
Journées équations aux dérivées partielles (1976), article no. 12, 3 p. 
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     year = {1976},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1976____A12_0/}
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Persson, Jan. The Cauchy problem and Hadamard's example. Journées équations aux dérivées partielles (1976), article  no. 12, 3 p. http://archive.numdam.org/item/JEDP_1976____A12_0/

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