Pajares, J. A., S. García, J. J. Díez, D. Martín, and M. C. García-Vallejo. “Feeding Responses by Scolytus Scolytus to Twig Bark Extracts from Elms”. Forest Systems, Vol. 13, no. 1, Apr. 2004, pp. 217-25, doi:10.5424/826.