Titlebook: Harmonic Analysis and Boundary Value Problems in the Complex Domain; Mkhitar M. Djrbashian Book 1993 Springer Basel AG 1993 Boundary value

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The simplest Cauchy type problems and the boundary value problems connected with them,cted there for .(0,σ), also turn out to be systems of eigenfunctions. But in this case they are systems of eigenfunctions of some non-ordinary boundary value problems formulated in terms of integro-differential operators of fractional orders.