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Ambili Raj, D. B., Biju, S., & Reddy, M. L. P. (2009). 4,4,5,5,5-Pentafluoro-1-(9H-fluoren-2-yl)-1,3-pentanedione complex of Eu3+ with 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene oxide as a promising light-conversion molecular device. Dalton Transactions, (36), 7519. doi:10.1039/b907031a 
10.1039/B907031A