MathSciNet bibliographic data MR271536 (42 #6419) 35.48 Fediĭ, V. S. Estimates in the \$H\sb{(s)}\$$H\sb{(s)}$ norms, and hypoellipticity. (Russian) Dokl. Akad. Nauk SSSR 193 1970 301–303. Links to the journal or article are not yet available

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