bui th trung ktlduewiutwentenl dear looking papers explain detail intractability issue best including mathematical proofs dynamic decision network thank advance help trung trung h bui human media interaction group university twente zilverling drienerlolaan 5 7522 nb enschede netherlands room inf2063 zilverling phone 3153489 4647 fax 3153489 3503 email kqcuecsutwentenl thu 07 aug 2008 112625 0200 uai ask reference computational complexity ddn