@misc{Meer2016, author = {Klaus Meer}, title = {An Extended Tree-Width Notion for Directed Graphs Related to the Computation of Permanents}, booktitle = {Theory of Computing Systems}, volume = {55}, number = {2}, issn = {1432-4350}, institution = {FG Theoretische Informatik}, type = {articler}, pages = {330 -- 346}, year = {2016}, }