Tinant, B., Germain, G., Declercq, J.-P., & Van Meerssche, M. (1979). Structure de la dibenzyl-4,4′ diphényl-2,2′ [biimidazoline-4,4′]dione-5,5′. Societes Chimiques Belges. Bulletin, 88, 143-146. https://hdl.handle.net/2078.5/206514 (Original work published 1979)