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2. Fluorescence of DPH derivatives. Evidence for emission from S2 and S1 excited states
3. The effect of moderately high pressure on the fluorescence spectra of 1,6-diphenylhexatriene, 1,6-[4,4'-dicyanophenyl]hexatriene and 1,8-diphe- nyloctatetraene
4. Dual fluorescence of diphenylpolyenes