@techreport {icl:391, title = {Computing the Conditioning of the Components of a Linear Least Squares Solution}, journal = {University of Tennessee Computer Science Technical Report}, number = {UT-CS-07-604, (also LAPACK Working Note 193)}, year = {2007}, month = {2007-01}, author = {Marc Baboulin and Jack Dongarra and Serge Gratton and Julien Langou} }