@techreport{LamMT01,
  author = {R. Lamour and R. M{\"a}rz and C. Tischendorf},
  title = {{PDAEs} and Further Mixed Systems as Abstract Differential Algebraic
	Systems},
  institution = {Inst. of Math.},
  year = {2001},
  number = {01-11},
  address = {Humboldt Univ.\ of Berlin},
  url = {http://www2.math.hu-berlin.de/publ/publ01.html}
}