On integral formulas of the (unit) sphere and their application to numerical computation of integrals. - Willi Freeden (Computing, 1980)

Exact computation of spherical harmonics. - Willi Freeden; Richard Reuter (Computing, 1984)

Metaharmonic splines for solving the exterior Dirichlet Problem for the Helmholtz equation. - Willi Freeden (Topics in Multivariate Approximation, 1987)

An Adaptive Hierarchical Approximation Method on the Sphere Using Axisymmetric Locally Supported Basis Functions. - Rüdiger Brand; Willi Freeden; Jochen Fröhlich (Computing, 1996)

Equidistribution on the Sphere. - Jianjun Cui; Willi Freeden (SIAM J. Sci. Comput., 1997)

Orthogonal Zonal, Tesseral and Sectorial Wavelets on the Sphere for the Analysis of Satellite Data. - Willi Freeden; Volker Michel (Adv. Comput. Math., 2004)

Wavelet Deformation Analysis for Spherical Bodies. - Willi Freeden; Volker Michel (Int. J. Wavelets Multiresolution Inf. Process., 2005)

A Nonlinear Galerkin Scheme Involving Vector and Tensor Spherical Harmonics for Solving the Incompressible Navier-Stokes Equation on the Sphere. - M. J. Fengler; Willi Freeden (SIAM J. Sci. Comput., 2005)

Modeling Tangential Vector Fields on Regular Surfaces by Means of Mie Potentials. - Willi Freeden; Carsten Mayer (Int. J. Wavelets Multiresolution Inf. Process., 2007)