Geodesic
On the global hypoellipticity property of a higher-order differential operator
Differencialʹnye uravneniâ, Tome 26 (1990) no. 4, pp. 687-692 
Nguyẽn Minh Trí. On the global hypoellipticity property of a higher-order differential operator. Differencialʹnye uravneniâ, Tome 26 (1990) no. 4, pp. 687-692. http://geodesic.mathdoc.fr/item/DE_1990_26_4_a16/
@article{DE_1990_26_4_a16,
     author = {Nguyẽn Minh Tr{\'\i}},
     title = {On the global hypoellipticity property of a higher-order differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {687--692},
     year = {1990},
     volume = {26},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a16/}
}
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