TY - GEN A1 - Meer, Klaus T1 - An Extended Tree-Width Notion for Directed Graphs Related to the Computation of Permanents T2 - Theory of Computing Systems Y1 - 2016 UR - https://opus4.kobv.de/opus4-UBICO/frontdoor/index/index/docId/15565 SN - 1432-4350 VL - 55 IS - 2 SP - 330 EP - 346 ER -