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Pashkin, A. and Porer, M. and Beyer, M. and Kim, K.W. and Dubroka, A. and Bernhard, C. and Yao, X. and Dagan, Y. and Hackl, R. and Erb, A. and Demsar, J. and Huber, Rupert and Leitenstorfer, A. (2010) Femtosecond Response of Quasiparticles and Phonons in Superconducting YBa2Cu3O7-δ Studied by Wideband Terahertz Spectroscopy. Physical Review Letters (PRL) 105 (6), 067001.