@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} }