Patna/Bhagalpur, Feb 18 (PTI) The Archaeological Survey of India (ASI) has started excavation work to further unearth remnants of Vikramasila Mahavihara, the celebrated university founded by Pala king Dharmapala in late 8th or early 9th Century AD, at Antichak village in Bihar's Bhagalpur district after a gap of almost 42 years.