Y. Quinet, R. Hamidi, M. X. Ruiz-Gonzalez, J.-C. de Biseau, and J. T. Longino, “Crematogaster pygmaea (Hymenoptera: Formicidae: Myrmicinae), a highly polygynous and polydomous Crematogaster from northeastern Brazil”, Zootaxa, vol. 2075, no. 1, pp. 45–54, Apr. 2009.