On the conjugate of periodic piecewise harmonic functions. - Dag Lukkassen; Annette Meidell; Peter Wall (Networks Heterog. Media, 2008)

Nonlinear laminates where the effective conductivity is integer valued. - Dag Lukkassen; Ralph Høibakk; Annette Meidell (Appl. Math. Lett., 2012)

On Heat Conduction in Domains Containing Noncoaxial Cylinders. - Dag Lukkassen; Annette Meidell (Int. J. Math. Math. Sci., 2012)

Generalized Chessboard Structures Whose Effective Conductivities Are Integer Valued. - Dag Lukkassen; Annette Meidell (J. Appl. Math., 2012)