@inproceedings{Tis98,
  author = {C. Tischendorf},
  title = {Topological index-calculation of {DAE}s in circuit simulation},
  booktitle = {Z. angew. Math. Mech.},
  year = {1998},
  volume = {78},
  number = {S3},
  pages = {S1103--S1104},
  doi = {10.1002/zamm.199807815118}
}