Detection of vascular endothelial growth factor (VEGF) and tumor necrosis factor alpha (TNF-α) in epiretinal membranes of proliferative diabetic retinopathy, proliferative vitreoretinopathy and macular pucker. - Armstrong,D.; Augustin,A.J.; Spengler,R.; Al-Jada,A.; Nickola,T.; Grus,F. (Ophthalmologica, 1998)