@inproceedings{RiaT10b,
  author = {R. Riaza and C. Tischendorf},
  title = {Existence of Purely Imaginary Eigenvalues for {DAEs} with Network
	Structure},
  booktitle = {{ICNAAM} 2010: {I}nternational {C}onference on {N}umerical {A}nalysis
	and {A}pplied {M}athematics 2010: {AIP} {C}onference {P}roceedings},
  year = {2010},
  volume = {1281},
  pages = {1000-1003},
  doi = {10.1063/1.3497787}
}