@misc{Driessel2007,
author = {Driessel, K. R.},
title= {Computing the best positive semi-definite approximation of a symmetric matrix using a flow},
year = {2007},
URL = {http://www.ima.umn.edu/AlgGeom/W3.5-9.07/activities/Driessel-Kenneth/poster.pdf},
publisher = {Institute for Mathematics and its Applications: Applications in Biology, Dynamics, and Statistics},
}