Geodesic
On the negative spectrum of an elliptic operator
Informatics and Automation, Differential equations and functional spaces, Tome 192 (1990), pp. 61-67.

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     author = {Yu. V. Egorov and V. A. Kondrat'ev},
     title = {On the negative spectrum of an elliptic operator},
     journal = {Informatics and Automation},
     pages = {61--67},
     publisher = {mathdoc},
     volume = {192},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1990_192_a5/}
}
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Yu. V. Egorov; V. A. Kondrat'ev. On the negative spectrum of an elliptic operator. Informatics and Automation, Differential equations and functional spaces, Tome 192 (1990), pp. 61-67. http://geodesic.mathdoc.fr/item/TRSPY_1990_192_a5/