The collapse of a sonoluminescent cavitation bubble imaged with X-ray free-electron laser pulses oleh Hannes P Hoeppe, Markus Osterhoff, Atiyeh Aghel Maleki, Juan M Rosselló, Malte Vassholz, Johannes Hagemann, Thea Engler, Daniel Schwarz, Angel Rodriguez-Fernandez, Ulrike Boesenberg, Johannes Möller, Roman Shayduk, Jörg Hallmann, Anders Madsen, Robert Mettin, Tim Salditt