Kumar, N., Kaushik, S.L., Grover, N. and Sharma, R.L. 2016. Retinopathy of prematurity: incidence and risk factors: a hospital based study from Shimla, Himachal Pradesh, India. International Journal of Research in Medical Sciences. 5, 1 (Dec. 2016), 56–61. DOI:https://doi.org/10.18203/2320-6012.ijrms20164400.