Experimental evidence for the aggregation of photostimulable centers in BaFBr:Eu2+ single crystals by cross relaxation spectroscopy F. K. Koschnick, J.-M. Spaeth, R. S. Eachus, W. G. McDugle, and R. H. D. Nuttall Phys. Rev. Lett. 67, 3571 - 3574 (1991)
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http://dx.doi.org/10.1103/PhysRevLett.67.3571