Rullan-Silva, C., Olthoff, A., Delgado de la Mata, J. and Pajares-Alonso, J. 2013. Remote Monitoring of Forest Insect Defoliation -A Review-. Forest Systems. 22, 3 (Dec. 2013), 377-391. DOI:https://doi.org/10.5424/fs/2013223-04417.