Katsan, S.V., and S.G. Fedtova o. “Serum VEGF Levels in Infants at Risk for Developing Retinopathy of Prematurity”. Ukrainian Journal of Ophthalmology , no. 3 (November 26, 2025): 9–13. Accessed February 5, 2026. https://ua.ozhurnal.com/index.php/files/article/view/637.