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Higher order differential operators with finite number of $\delta$-interactions in multivariate case
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 6 (2010) no. 3, pp. 266-276 Cet article a éte moissonné depuis la source Math-Net.Ru

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A formula for calculating the defect number of a multi-center differential operator of higher order is obtained. The spectral properties of selfadjoint operators describing the finite number pointwise interactions are studied. 
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E. H. Eyvazov. Higher order differential operators with finite number of $\delta$-interactions in multivariate case. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 6 (2010) no. 3, pp. 266-276. http://geodesic.mathdoc.fr/item/JMAG_2010_6_3_a1/

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