Desulphurisation in coal combustion systems : a three-day symposium organised by The Institution of Chemical Engineers in association with the IChemE Coal Utilisation Subject Group, co-sponsored by The Institute of Energy and The Institution of Mechanical Engineers, and held at the University of Sheffield, 19-21 april 1989 / The Institution of Chemical Engineers, IChemE Coal Utilisation Subject Group. — 1989 Ir a Ficha