@article{AliBGT03, author = {G. Al{\'i} and A. Bartel and M. G{\"u}nther and C. Tischendorf}, title = {Elliptic Partial Differential--Algebraic Multiphysics Models in Electrical Network Design}, journal = {Math. Models Meth. Appl. Sci.}, year = {2003}, volume = {13}, pages = {1261-1278}, number = {9}, doi = {10.1142/S0218202503002908} }