An Algorithm for Computing Fundamental Solutions of Difference Operators. - Henrik Brandén; Per Sundqvist (Numer. Algorithms, 2004)

Accelerating the Computation of 3D Gradient Vector Flow Fields. - Erik Vidholm; Per Sundqvist; Ingela Nyström (ICPR (3), 2006)

Discrete Fundamental Solution Preconditioning for Hyperbolic Systems of PDE. - Henrik Brandén; Sverker Holmgren; Per Sundqvist (J. Sci. Comput., 2007)