@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} }