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M. Kuchta, K. Mardal and M. Mortensen. "Preconditioning trace coupled 3d-1d systems using fractional Laplacian." Numerical Methods for Partial Differential Equations 35: 375-393.
M. Kuchta, K. Mardal and M. Mortensen. "On the singular Neumann problem in linear elasticity." Numerical Linear Algebra with Applications 26: e2212.