Geodesic
Higher moments in a model of zero-width slits
Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 1, pp. 11-17 Cet article a éte moissonné depuis la source Math-Net.Ru

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A model of zero-width slits with higher moments is described. It is based on the theory of extensions of operators in a space with indefinite metric. The way of choosing the parameters of the extensions that ensures the necessary correspondence between the model and real solutions is indicated. An approximation for the resonances of a Helmholtz resonator is obtained. 
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A. A. Kiselev; I. Yu. Popov. Higher moments in a model of zero-width slits. Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 1, pp. 11-17. http://geodesic.mathdoc.fr/item/TMF_1991_89_1_a1/

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