Low temperature dependence of the penetration depth in YBCO thin films revisited by mm wave transmission and surface impedance measurementsS. Djordjevic, E. Farber, G. Deutscher, N. Bontemps, O. Durand and J. P. ContourEur. Phys. J. B, 25 4 (2002) 407-416DOI: https://doi.org/10.1140/epjb/e20020046