Duan, R., Wagner, M., Müllen, K., & Li, C. (2018). D1-A-D2-A-D1-type constitutional pi-conjugated small molecular isomers bearing benzodithiophene, benzothiadiazole, and thiophene. Dyes and Pigments, 151, 54-63. doi:10.1016/j.dyepig.2017.12.042.