Wolfgang Espelage Frank Gurski Egon Wanke Deciding Clique-Width for Graphs of Bounded Tree-Width. 87-98 2001 conf/wads/2001 WADS http://link.springer.de/link/service/series/0558/bibs/2125/21250087.htm db/conf/wads/wads2001.html#EspelageGW01