Determination of the triplet state energies of a series of conjugated porphyrin oligomers - Kuimova, MK; Hoffmann, M; Winters, MU; Eng, M; Balaz, M; Clark, IP; Collins, HA; Tavender, SM; Wilson, CJ; Albinsson, B; Anderson, HL; Parker, AW; et al. (PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 2007)