Porto, João, Bárbara Rodrigues, Joana Guimarães, Nuno Devesa, J. Diniz Vieira, M. Borges Alexandrino, and J. J. Alves Moura. 2008. “Pheochromocytoma Crisis – Two Clinical Case Reports”. Internal Medicine 15 (1). Lisboa, Portugal:24-31. https://revista.spmi.pt/index.php/rpmi/article/view/1445.