@misc{StangeGriewankBollhoefer2006, author = {Peter Stange and Andreas Griewank and Matthias Bollh{\"o}fer}, title = {On the Efficient Update of Rectangular LU Factorizations subject to Low Rank Modifications}, institution = {Humboldt-Universit{\"a}t zu Berlin}, type = {preprintmatheon}, year = {2006}, }