MR1718767 Nakanishi, Kenji Kenji NAKANISHI Local wellposedness and illposedness in the critical Besov spaces for semilinear wave equations with quadratic forms Funkcialaj Ekvacioj. Serio Internacia 42 1999 261--279 http://fe.math.kobe-u.ac.jp/FE/FullPapers/vol42/fe42-2-6.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE41-45-en_KML/fe42-261-279/fe42-261-279.pdf http://www.ams.org/mathscinet-getitem?mr=MR1718767 fe42-261-279 1999 Local Wellposedness and Illposedness in the Critical Besov Spaces for Semilinear Wave Equations with Quadratic Forms NAKANISHI, Kenji Kenji NAKANISHI
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