Martelli, Bruno, Matteo Novaga, Alessandra Pluda, and Stefano Riolo. “Spines of Minimal Length”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 17, no. 3 (September 21, 2017): 1067-1090. Accessed May 26, 2025. http://20.103.181.36/index.php/annaliscienze/article/view/522.