Pelosi, G., and W. D. Travis. “The Ki-67 Antigen in the New 2021 World Health Organization Classification of Lung Neuroendocrine Neoplasms”. Pathologica - Journal of the Italian Society of Anatomic Pathology and Diagnostic Cytopathology, Vol. 113, no. 5, Nov. 2021, pp. 377-8, https://www.pathologica.it/article/view/542.