Rigato, F.; Sciaky, R. 1991. The myrmecofauna of the Gesso Valley (Maritime Alps) (Hymenoptera Formicidae). Ethology Ecology and Evolution Special Issue 1:87-89.

Billen, J. P. J. 1991. Ultrastructural organization of the exocrine glands in ants. Ethology Ecology and Evolution Special Issue 1:67-73.

Fanfani, A.; Dazzini Valcurone, M. 1991a. Metapleural glands of some Dolichoderinae ants. Ethology Ecology and Evolution Special Issue 1:95-98.

Poldi, B. 1992. A poorly known taxon: Diplorhoptrum orbulum (Emery 1875). Ethology Ecology and Evolution Special Issue 2:91-94. PDF