no. 4
Nonunique continuation for plane uniformly elliptic equations in Sobolev spaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 29 (2000) no. 4, pp. 731-754. 
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     title = {Nonunique continuation for plane uniformly elliptic equations in {Sobolev} spaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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     zbl = {1072.35049},
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Buonocore, Pasquale; Manselli, Paolo. Nonunique continuation for plane uniformly elliptic equations in Sobolev spaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 29 (2000) no. 4, pp. 731-754. http://www.numdam.org/item/ASNSP_2000_4_29_4_731_0/

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