@techreport {icl:645, title = {Hierarchical QR Factorization Algorithms for Multi-Core Cluster Systems}, journal = {University of Tennessee Computer Science Technical Report (also Lawn 257)}, number = {UT-CS-11-684}, year = {2011}, month = {2011-10}, keywords = {magma, plasma}, author = {Jack Dongarra and Mathieu Faverge and Thomas Herault and Julien Langou and Yves Robert} }