1. Haruma, K., Kamada, T., Manabe, N., Suehiro, M., Kawamoto, H., & Shiotani, A. (2018). Old and new gut hormone, gastrin and acid suppressive therapy. Digestion, 97, 340–344.
2. Solcia, E., Capella, C., Buffa, R., Usellini, L., Frigerio, B., & Fontana, P. (1979). Endocrine cells of the gastrointestinal tract and related tumors. Pathobiology Annual, 9, 163–204.