. "1990"^^ . . "Boudot, J., Jacquemin, G. & Dumont, H. 1990. Revision of the subspecies of Onychogomphus forcipatus (Linnaeus, 1758) in Europe and Asia Minor, and the true distribution of Onychogomphus forcipatus unguiculatus (Vander Linden, 1823) (Odonata, Gomphidae). Bulletin & Annales de la Societe Royale Belge d'Entomologie, 126(7-9): 95-111." . . "Boudot et al. (1990)" . "1990"^^ . "Boudot et al. (1990)" .