@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.} }