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    Ping Cai et al.. “Effects of including electron-withdrawing atoms on the physical and photovoltaic properties of indacenodithieno[3, 2-b]thiophene-based donor–acceptor polymers: towards an acceptor design for efficient polymer solar cells.” RSC advances, vol. 7, no. 33, 2017, pp. 20440–20450. http://access.bl.uk/ark:/81055/vdc_100045296649.0x000064