Geodesic
Strongly elliptic difference-differential operators in semibounded cylinder
Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 1, pp. 289-293.

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In the paper we consider difference-differential operator in semibounded cylinder and obtain necessary and sufficient conditions for a Gårding-type inequality using a symbol of the operator. 
@article{FPM_2001_7_1_a19,
     author = {L. E. Rossovskii},
     title = {Strongly elliptic difference-differential operators in semibounded cylinder},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {289--293},
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     volume = {7},
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     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2001_7_1_a19/}
}
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L. E. Rossovskii. Strongly elliptic difference-differential operators in semibounded cylinder. Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 1, pp. 289-293. http://geodesic.mathdoc.fr/item/FPM_2001_7_1_a19/