1. The epidemiology of stroke in Asia;Viriyavejakul;International joint conference on stroke and cerebral circulation, Bombay,1994
2. Epidemiological study on subarachnoid haemorrhage in India. New Delhi. Indian Council of Medical Research, 1987
3. Variation in the form of circle of Willis;Riggs;Arch Neurol,1963
4. Circle of Willis in Cerebral Vascular disorders;Alpers;The anatomical structure. Arch Neurol,1963
5. Pathology of the cerebral blood vessels;Stehbens;St Louis. CV Mosby Co,1972