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Translated from Matematicheskie Zametki, Vol. 49, No. 2, pp. 147–150, February, 1991.
The author expresses thanks to Professor Yu. V. Egorov for interest in the present paper.
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Chi, N.M. Global hypoellipticity property of a differential operator. Mathematical Notes of the Academy of Sciences of the USSR 49, 221–223 (1991). https://doi.org/10.1007/BF01137558
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DOI: https://doi.org/10.1007/BF01137558