Open Access
1992 Hypoelliptic operators in $R^3$ of the form $X_1^2+X_2^2$
Yoshinori Morimoto
J. Math. Kyoto Univ. 32(3): 461-484 (1992). DOI: 10.1215/kjm/1250519488
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Vol.32 • No. 3 • 1992
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