1. Neuroendocrine Tumors of the Hepatobiliary Tract
   Arthur Zimmermann, 2017, Tumors and Tumor-Like Lesions of the Hepatobiliary Tract CrossRef
2. Neuroendocrine Tumors of the Hepatobiliary Tract
   Arthur Zimmermann, 2016, Tumors and Tumor-Like Lesions of the Hepatobiliary Tract CrossRef