1. Agresti A (2002) Categorical data analysis, 2nd edn. Wiley, New York
2. Allioni C (1766) Lepidoptera. In: Manipulus Insectorum Taurinensium a Carolo Allionio editus. Miscellanea di Filosophia e Matematica della Società Reale di Torino per gli anni 1762–1765 N. 3185–3198
3. Balletto E, Kudrna O (1985) Some aspects of the conservation of the butterflies (Lepidoptera: Papilionoidea) in Italy, with recommendations for the future strategy. Boll Soc Ent Ital 117:39–59
4. Balletto L, Bonelli S, Cassulo L (2005) Mapping the Italian butterfly diversity for conservation. In: Kühn E, Feldmann R, Thomas JA, Settele J (eds) Studies on the ecology and conservation of butterflies in Europe. 1. General concepts and case studies. Pensoft Publ. Co., Sofia & Moscow, pp 71–76
5. Balletto E, Bonelli S, Cassulo L (2007) Insecta Lepidoptera Papilionoidea. In: Ruffo S, Stoch F (eds) Checklist and distribution of the Italian Fauna. 10,000 terrestrial and inland water species. 2nd and revised edition—Memorie del Museo Civico di Storia Naturale di Verona, 2° serie, Sez. Scienze della Vita. 17: 257–261, 280 pls on CD-ROM