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At nonzero frequencies both the normal and superfluid fractions, as well as moving vortices, contribute to the electrical transport, resulting in intricate expressions for the resistivity. We present an extended study of microwave resistivity data measured on YBa 2 Cu 3 O 7−δ , SmBa 2 Cu 3 O 7−δ , and MgB2 by means of a broad-band technique between 2 and 20 GHz and of a resonant system at 50 GHz. We discuss the main experimental fingerprints that allow one to identify the relevance of thedoi:10.12693/aphyspola.111.87 fatcat:svflzj2b2vchbdnphyd7zds4au