MR0267261 Ak{\^o}, Kiyoshi Kiyoshi AKÔ On the Dirichlet problem for second order elliptic differential equations Funkcialaj Ekvacioj. Serio Internacia 12 1970 205--220 http://fe.math.kobe-u.ac.jp/FE/Free/vol12/fe12-12.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe12-205-220/fe12-205-220.pdf http://www.ams.org/mathscinet-getitem?mr=MR0267261 fe12-205-220 1970 On the Dirichlet Problem for Second Order Elliptic Differential Equations Ak\^o, Kiyoshi Ak\^o, Kiyoshi
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