Connected partial differential operators with different principal parts
Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 121-125.

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     author = {V. I. Pa\v{s}kovskii},
     title = {Connected partial differential operators with different principal parts},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
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     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a16/}
}
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V. I. Paškovskii. Connected partial differential operators with different principal parts. Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 121-125. http://geodesic.mathdoc.fr/item/DE_1977_13_1_a16/