public List<String> getIDS()
	{
		List<String> citationIDS=new ArrayList<>();
		String query="select distinct "+attr+" from "+tablename+" order by paperid asc limit "+cur+","+limit;
		ResultSet rsSet=sqLconnection.Query(query);
		try {
			while(rsSet.next())
			{
				String id=rsSet.getString(attr);
				citationIDS.add(id);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		this.sqLconnection.disconnectMySQL();
		return citationIDS;
	}