MathSciNet bibliographic data MR2231873 35H10 (35A20 35H20) Himonas, A. Alexandrou; Petronilho, Gerson On $C^\infty$$C^\infty$ and Gevrey regularity of sublaplacians. Trans. Amer. Math. Soc. 358 (2006), no. 11, 4809–4820. Article

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