Hughes, G., Kreher, D., Wang, C., Batsanov, A., & Bryce, M. (2004). Ethynyl pi-extended 2,5-diphenyl-1,3,4-oxadiazoles and 2-phenyl 5-(2-thienyl)-1,3,4-oxadiazoles: synthesis, X-ray crystal structures and optical properties. Organic and Biomolecular Chemistry, 2(22), 3363-3367