Yin, Yan-Bai, et al. “Synthesis, Crystal Structure and Insecticidal Activity of 1-[2-(3-Ethyl-2,2-dimethylcyclobutyl)acetyl]-3-O-Tolylthiourea”. Asian Journal of Chemistry, vol. 26, no. 7, Mar. 2014, pp. 1988-90, doi:10.14233/ajchem.2014.15611.