Carvalho, R., F. R. Gomes, L. Gonçalves, S. Miranda, F. Branquinho, and L. Dutschmann. “Primary Extragonadal Germcell Tumor With Choriocarcinoma? Case Report”. Internal Medicine, vol. 15, no. 4, Dec. 2008, pp. 263-7, https://revista.spmi.pt/index.php/rpmi/article/view/1492.