@Other{IbragimowRjasanowStraube_2005,
title={Hierarchical Cholesky decomposition of sparse matrices arising from curl-curl-equation},
author={Ibragimow, Ilgis and Rjasanow, Sergej and Straube, Katharina},
doi={http://dx.doi.org/10.22028/D291-26317},
year={2005}
}