Ferri, D., D. Baldini, and G. M. Baldini. “A Successful Twin Healthy Live Birth Achieved from Eggs With a Rare Perivitelline Space Abnormality: A Case Report”. International Journal of Reproductive BioMedicine (IJRM), Vol. 21, no. 3, Apr. 2023, pp. 263–267, doi:10.18502/ijrm.v21i3.13202.