Geodesic
Hypoellipticity of a second-order differential operator
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1985), pp. 96-99

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     author = {E. I. Ganzha},
     title = {Hypoellipticity of a second-order differential operator},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {96--99},
     publisher = {mathdoc},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_6_a17/}
}
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E. I. Ganzha. Hypoellipticity of a second-order differential operator. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1985), pp. 96-99. http://geodesic.mathdoc.fr/item/VMUMM_1985_6_a17/