[en] A calculation has been made of the inelastic magnetic neutron scattering of cubic metallic compounds with Ce in a valence intermediate between 3 and 4. It is assumed that the states of Ce are ionic, and the system is described with a Hamiltonian that contains a hybridisation term. This Hamiltonian is essentially an Anderson Hamiltonian, but operators are used that create or annihilate impurities instead of the usual Fermion operators. Green function techniques are employed to calculate the required cross section and the fractional valence of Ce. A good agreement is obtained with recent measurements performed on CePd₃. The extension of the theory to other ions in mixed valence states is straightforward. (author)