Sílvia Helena Bersácola, Carlos Alberto de Castro Pereira, Rita de Cássia Cruz da Silva, Ricardo M. Ladeira
Bersácola SH, Pereira CAC, Silva RCC, Ladeira RM. Chronic dyspnea with unexplained cause: evaluation of an investigation protocol with 90 patients. J Bras Pneumol. 1998;24(5):283-297