  In this paper, we examine the possible influence of extrinsic factors on the
electrical and magnetotransport of La(0.67)Ca(0.33)Mn(1-x)Ru(x)O(3) (x < 0.10).
These results not only exclude the extrinsic factors, but establishes the fact
that the metal transitions both exhibiting MR is intrinsic to Ru substituted
La(0.67)Ca(0.33)MnO(3) and the system. These results substantiate our
hypothesis that Ru substituted system undergoes a magnetic phase separation
involving the co-existence of two ferromagnetic-metallic phases in its ground
state.
