Bohinc, T., and S. Trdan. “Comparison of Insecticidal Efficacy of Four Natural Substances Against Granary Weevil (Sitophilus Granarius [L.]) Adults: Does the Combined Use of the Substances Improve Their Efficacy?”. Spanish Journal of Agricultural Research, Vol. 15, no. 3, Dec. 2017, p. e1009, doi:10.5424/sjar/2017153-11172.