On conditions for the discreteness of the spectrum for a general pseudo-differential operator
Differencialʹnye uravneniâ, Tome 33 (1997) no. 1, pp. 133-135.

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     author = {S. R. Umarov and \`E. M. Saidamatov},
     title = {On conditions for the discreteness of the spectrum for a general pseudo-differential operator},
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     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_1_a19/}
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S. R. Umarov; È. M. Saidamatov. On conditions for the discreteness of the spectrum for a general pseudo-differential operator. Differencialʹnye uravneniâ, Tome 33 (1997) no. 1, pp. 133-135. http://geodesic.mathdoc.fr/item/DE_1997_33_1_a19/