Vincenti, F., A. Basile, E. Contro, F. Galbiati, A. Oppizzi, E. Restelli, M. Sommariva, and D. Coen. “Outcome at Three Months of COPD Patients With Acute Hypercapnic Respiratory Failure Treated With NPPV in an Acute Medicine Ward”. Emergency Care Journal, vol. 7, no. 1, Mar. 2011, pp. 5-9, doi:10.4081/ecj.2011.1.5.