Karim, M. R.; Sheikh, M. R. K.; Islam, M. S.; Salleh, N. M.; Yahya, R. Synthesis, Crystal Structure, Mesophase Behaviour and Optical Property of Azo-Ester Bridged Compounds: Azo-Ester Bridged Compounds. J. Sci. Res. 2019, 11, 383-395.