1. Weitere Erfahrungen mit der Lichtcoagulation bei Retinopathia diabetica;Schott;Deutsch. Ophth. Gen.,1964
2. The effectiveness of photocoagulation in the therapy of proliferative retinopathy;Okun;Tr. Am. Acad. Ophth. Otol.,1968
3. The role of photocoagulation in the therapy of proliferative diabetic retinopathy;Okun;Arch. Ophth.,1966
4. Further observations on the treatment of diabetic retinopathy by light coagulation;Wetzig;Tr. Am. Acad. Ophth. Otol.,1967