T. Akamatsu: "Remarks on ranks of Lie algebras associated with a second order partial differential operator and necessary conditions for hypoellipticity"Proc. School of Sci. Tokai Univ.. Vol.34. 1-12 (1999)

T. Akamatsu: "Remarks on ranks of Lie algebras associated with a second order partial differential operator and necessary conditions for hypoellipticity"Proc. School of Sci. Tokai Univ.. Vol.34. 1-12 (1999)
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T. Akamatsu:“关于与二阶偏微分算子相关的李代数的秩和亚椭圆性的必要条件的评论”Proc。

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