Geodesic
On approximation of solutions of some semi-elliptic equations in $\mathbb{R}^n$
Eurasian mathematical journal, Tome 1 (2010) no. 2, pp. 59-75.

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It is proved that for some semi-elliptic equations the solution can be obtained as the limit when $\sigma\rightarrow\infty$, of the solution $u_\sigma$ of a boundary value problem in the generalised ball $B_{\sigma,\mu}$. Also an estimatie at infinity for the tempered fundamental solution is obtained. 
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G. V. Dallakyan. On approximation of solutions of some semi-elliptic equations in $\mathbb{R}^n$. Eurasian mathematical journal, Tome 1 (2010) no. 2, pp. 59-75. http://geodesic.mathdoc.fr/item/EMJ_2010_1_2_a3/

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