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Baldo, M. A.; O'Brien, D. F.; You, Y.; Shoustikov, A.; Sibley, S.; Thompson, M. E.; Forrest, S.R. Highly Efficient phosphorescent emission from organic electroluminescent devices. Nature. 1998, 395 (6698): 151–154. Bibcode:1998Natur.395..151B. doi:10.1038/25954.
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