@article{EstT01,
  author = {D. {Est{\'e}vez Schwarz} and C. Tischendorf},
  title = {Mathematical Problems in Circuit Simulation},
  journal = {Math. Comput. Model. Dyn. Syst.},
  year = {2001},
  volume = {7},
  pages = {215--223},
  number = {2},
  doi = {10.1076/mcmd.7.2.215.3647}
}