[1]
C. C. Cely and C. E. Sarmiento, “What about intraspecific variation? Reassessment of taxonomic and phylogenetic characters in the genus Synoeca de Saussure (Hymenoptera: Vespidae: Polistinae)”, Zootaxa, vol. 2899, no. 1, pp. 43–59, May 2011.