Sood, S., Narang, S., Kocchhar, S., Sarda, S., Aggarwal, S. and Arya, S. (2013) “Correlation of progression of diabetic retinopathy with the alterations in retrobulbar circulation”, Nepalese Journal of Ophthalmology, 5(2), pp. 147–153. doi: 10.3126/nepjoph.v5i2.8705.