Westlin, Jan-Erik, et al. “Somatostatin Receptor Scintigraphy of Carcinoid Tumours Using the [111In-Dtpa-D-Phe1]-Octreotide”. Acta Oncologica, vol. 32, no. 7-8, Jan. 1998, pp. 783-6, doi:10.3109/02841869309096136.