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How Narrow is the Linewidth of Parametric X-Ray Radiation?Brenzinger, K.-H.; Limburg, B.; Backe, H.; Dambach, S.; Euteneuer, H.; Hagenbuck, F.; Herberg, C.; Kaiser, K. H.; Kettig, O.; Kube, G.; Lauth, W.; Schöpe, H.; Walcher, Th. · Physical Review Letters · 1997