Metal-free polymerization: synthesis and properties of fused benzo[1,2-b:4,5-b′]bis[b]benzothiophene (BBBT) polymers - Yao,L; Liao,H; Ravva,MK; Guo,Y; Duan,J; Wang,Y; Yu,Y; Li,Z; McCulloch,I; Yue,W (POLYMER CHEMISTRY, 2020)