Open Access
1989 Hypoellipticity and existence of periodic solutions on $\mathbf{T}^d$
Masafumi Yoshino
Proc. Japan Acad. Ser. A Math. Sci. 65(4): 106-108 (1989). DOI: 10.3792/pjaa.65.106
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Vol.65 • No. 4 • 1989
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