Are the eigenvalues of the B-spline isogeometric analysis approximation of -Δu = λu known in almost closed form?

Sven-Erik Ekström, Isabella Furci, Carlo Garoni, Carla Manni, Stefano Serra Capizzano, Hendrik Speleers. Are the eigenvalues of the B-spline isogeometric analysis approximation of -Δu = λu known in almost closed form?. Numerical Lin. Alg. with Applic., 25(5), 2018. [doi]

Abstract

Abstract is missing.