Sehgal V N, Jain S, Bhattacharya S N, Thappa D M
Department of Dermatology and Venereology, Lady Hardinge Medical College and Associated SK and KSC Hospitals, New Delhi, India.
Int J Dermatol. 1994 Jan;33(1):16-20. doi: 10.1111/j.1365-4362.1994.tb01485.x.