Poletto, V., M. Biggiogera, E. Bonetti, M. Della Porta, C. Porta, M. Cinelli, S. Montagnani, D. Tafuri, F. Moccia, V. Rosti, and G. Guerra. “Ultrastructural and Functional Differences Between Normal and Tumor Endothelial Progenitor Cells”. Italian Journal of Anatomy and Embryology, vol. 119, no. 1, Mar. 2015, p. 154, https://oajournals.fupress.net/index.php/ijae/article/view/2507.