public String getAuthor(SQLconnection connection,int id)
	{
		String query="select author from dblpauthor where paperid="+id;
		ResultSet authorSet=connection.Query(query);
		String author="";
		try {
			while(authorSet.next())
			{
				author+=authorSet.getString("author")+",";
			}
			authorSet.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return author;
	}