Silva, Karla Kristine Dames, Agnaldo José Lopes, José Manoel Jansen, and Pedro Lopes de Melo. 2011. “ Total Inspiratory and Expiratory Impedance in Patients With Severe Chronic Obstructive Pulmonary Disease ”. Clinics 66 (12): 2085-91. https://doi.org/10.1590/S1807-59322011001200014.