Miroslaw Kowaluk Andrzej Lingas Johannes Nowak A Path Cover Technique for LCAs in Dags. 222-233 2008 SWAT http://dx.doi.org/10.1007/978-3-540-69903-3_21 conf/swat/2008 db/conf/swat/swat2008.html#KowalukLN08