3. B. Wang, J. Zhang, H.L. Tam, B. W, W.F. Zhang, M.S. Chan, F. Pan, G. Yu*, F.R. Zhu*, M.S. Wong*, "Impact of alkyl side chains on the photovoltaic and naphthodithiophene–benzothiadiazole", Polym. Chem. 2014, 5, 836.