Grajales, G. G. and Wcislo, W. T. (1998) “Nest architecture of group-living wasps <i>Microstigmus</i> (Hymenoptera: Sphecidae): role of the pedicel as a defense against ants”, Revista de Biología Tropical, 46(4), pp. 1141–1143. doi: 10.15517/rbt.v46i4.20862.