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A remark on the stability of $$C^\infty $$ C ∞ -hypoellipticity under lower-order perturbations

Crossref DOI link: https://doi.org/10.1007/s11868-015-0118-8

Published Online: 2015-05-20

Published Print: 2015-06

Update policy: https://doi.org/10.1007/springer_crossmark_policy