MR0655504 Fattorini, H. O. H. O. FATTORINI Some remarks on second order abstract Cauchy problems Fako de l'Funkcialaj Ekvacioj Japana Matematika Societo. Funkcialaj Ekvaciog. Serio Internacia 24 1981 331--344 http://fe.math.kobe-u.ac.jp/FE/Free/vol24/fe24-3-6.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe24-331-344/fe24-331-344.pdf http://www.ams.org/mathscinet-getitem?mr=MR0655504 fe24-331-344 1981 Some Remarks on Second Order Abstract Cauchy Problems FATTORINI, H. O. FATTORINI, H. O.
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