@article{29596,
author = {Lars Grasedyck},
title = {{Existence of a low rank or H-matrix approximant to the solution of a Sylvester equation}},
doi = {10.1002/nla.366},
journal = {Numerical linear algebra with applications},
pages = {371--389},
year = {2004},
volume = {11},
number = {4},
issn = {1070-5325},
}