@article{RiaT10,
  author = {Riaza, R. and Tischendorf, C.},
  title = {The hyperbolicity problem in electrical circuit theory},
  journal = {Mathematical Methods in the Applied Sciences},
  year = {2010},
  volume = {33},
  pages = {2037--2049},
  number = {17},
  doi = {10.1002/mma.1312},
  publisher = {John Wiley \& Sons, Ltd.}
}