Ietri, Daniele, and Francesca Silvia Rota. “The Geography Of European Urban Networks. The Participation In Research And Technological Development Projects”. Bollettino della Società Geografica Italiana (December 31, 2008): 345–366. Accessed October 12, 2026. https://www.bsgi.it/index.php/bsgi/article/view/7184.