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The correlation of magnetic moments has been investigated by neutron small-angle scattering in superconducting and normal Ce1-xTbxRu2. Samples with 20% Tb are superconducting below 2.6°K. In these samples ferromagnetic short-range order is found below 10°K. In spite of a maximum in the static susceptibility at 5°K no transition to long-range order is observed. In the whole temperature range between 1.5 and 10°K the experimental data can be fitted by an Ornstein-Zernike correlation function. At 1-5°K the correlation length is about 15 Å. No significant change is observed at the superconductive transition temperature. Samples with 40% Tb are not superconducting. The static susceptibility shows a maximum at 13°K. Above this temperature again ferromagnetic short-range order of the Ornstein-Zernike type is found. Below 13°K the intensity of scattered neutrons drops faster with scattering angle indicating long-range order.