[en] The energy-density for the Skyrme forces in the Hartree-Fock-approximation is compared with the energy-density in the quasi-Hartree-Fock-approximation for two-body nucleon-nucleon forces with hard-core repulsion. From these expressions the magnitudes of the corresponding Hartree-Fock parameters of the nucleon-nucleon force are estimated. As an example, a simple nucleon-nucleon force is constructed, which reproduces the results of the Skyrme force SII. The ambiguities of such an comparison are discussed. The Skyrme forces SII-SIV correspond to potentials with hard-core radii approx. equal to 0.5-0.7 F. Smaller hardcore radii correspond to larger exchange contributions. (orig.)