DUBLIN publicans Tom and Paul Mangan, whose bars include Doheny and Nesbitt's at Lower Baggot Street, are expanding their business interests. They are currently refurbishing Murray's bar at Bath Avenue, Sandymount, Dublin 4, after buying it for £1.075 million. The Mangan brothers' other bars are The Glenside in Churchtown, and the Stone Boat in Crumlin. The Stone Boat manager, John Tiernan, will hold an equity stake in Murray's.