Portal vein resection: a modified technique for reconstruction after pancreaticoduodenectomy - Machado, Marcel C. C.; Figueira, Estela R. R.; Machado, Marcel Autran C.; Jukemura, José; Cunha, José E. M.; Perini, Marcos V.; Bacchella, Telesforo (Journal of Surgical Oncology, 2004)