Magalhães, S., S. Pereira, I. Bessa, F. Guedes, and A. Pereira. “Malt Lymphoma Associated With Sjögren Syndrome: Clinical Report”. Internal Medicine, vol. 16, no. 4, Dec. 2009, pp. 224-9, https://revista.spmi.pt/index.php/rpmi/article/view/1429.