Porcelli, F. and Pellizzari, G. 2014. Description of female nymphal instars and adult female of Kermes echinatus Balachowsky (Hemiptera, Coccoidea, Kermesidae) based on specimens from Crete and mainland Greece, with a discussion on geographical variation. Zootaxa. 3878, 1 (Oct. 2014), 61–74. DOI:https://doi.org/10.11646/zootaxa.3878.1.5.