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We study the magnetic properties of heavy electrons in Ce(Ru 1-x Rh x ) 2 Si 2 and Ce 1-x La x Ru 2 Si 2 associated with ordering of a spin density wave. One of the short-range orders in CeRu 2 Si 2 is stabilized as a long-range order. Anisotropic gap opening occurs in partial Fermi surfaces below the ordering temperature T N and the rest of the Fermi surfaces contribute to heavy-fermion properties.