Lanfranco, D., S. Ide, C. Ruiz, H. Peredo, and I. Vives. “Sex Ratio of Hylurgus Ligniperda (F.), Hylastes Ater (Paykull) and Gnathotrupes Spp. (Coleoptera: Scolytidae)”. BOSQUE, vol. 22, no. 2, Dec. 2001, pp. 85-88, doi:10.4206/bosque.2001.v22n2-09.