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These biorthogonality conditions are properties satisfied by the eigenfunctions and adjoint eigenfunctions, which are used to compute the coefficients of the eigenfunction expansion solution. The biorthogonality conditions are derived for a class of fourth-order boundary value problems with variable coefficients that arise from separating variables of the governing Stokes equation. The method is applied to the slow, steady flow in a two-dimensional sectorial cavity; the fluid is set into motion by the uniform translation of a covering plate or belt.<\/jats:p>","DOI":"10.1137\/0156002","type":"journal-article","created":{"date-parts":[[2005,2,23]],"date-time":"2005-02-23T09:58:08Z","timestamp":1109152688000},"page":"19-39","source":"Crossref","is-referenced-by-count":39,"title":["Biorthogonal Series Solution of Stokes Flow Problems in Sectorial Regions"],"prefix":"10.1137","volume":"56","author":[{"given":"S. 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