Fusco, Nicola, Francesco Maggi, and Aldo Pratelli. “Stability Estimates for Certain Faber-Krahn,isocapacitary and Cheeger Inequalities”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 8, no. 1 (March 26, 2009): 51-71. Accessed May 28, 2025. http://20.103.181.36/index.php/annaliscienze/article/view/167.