Timely Communication: Efficient Algorithms for Solving a Fourth-Order Equation with the Spectral-Galerkin Method. - Petter E. Bjørstad; Bjørn Peter Tjøstheim (SIAM J. Sci. Comput., 1997)

High Precision Solutions of Two Fourth Order Eigenvalue Problems. - Petter E. Bjørstad; Bjørn Peter Tjøstheim (Computing, 1999)