M. Marcelino, E. L. Nobre, J. Conceição, L. Lopes, H. Vilar, and J. Jácome De Castro, “Superior vena cava syndrome and intrathoracic goiter: an unusual presentation in the 21st century”., Acta Med Port, vol. 22, no. 3, pp. 299–302, Jun. 2009.