XMM-Newton and Swift observations of WZ Sagittae: spectral and timing analysisA. A. Nucita, E. Kuulkers, F. De Paolis, K. Mukai, G. Ingrosso and B. M. T. MaioloA&A, 566 (2014) A121DOI: https://doi.org/10.1051/0004-6361/201322875