Putienko, A. et al. 2026. Results of research of brain-derived neurotrophic factor level (BDNF) in the vitreous body of patients with proliferative diabetic retinopathy. Ukrainian Journal of Ophthalmology . 1 (Jun. 2026), 31–35. DOI:https://doi.org/10.31288/oftalmolzh201613135.