@techreport{LamMT11b, author = {R. Lamour and R. M{\"a}rz and C. Tischendorf}, title = {Projector based treatment of linear constant coefficient {DAE}s}, institution = {Humboldt-University, Dep. of Mathematics}, year = {2011}, number = {11-15}, url = {http://www2.mathematik.hu-berlin.de/publ/pre/2011/P-11-15.pdf}, }