Pseudospectra

• Spectral conditioning and pseudospectral growth,
  with Adrian S. Lewis, and Michael L. Overton. Numerische Mathematik, 107(2007) 27-37.
• Convexity and Lipschitz behavior for small pseudospectra,
  with Adrian S. Lewis and Michael L. Overton, SIAM J. Matrix Analysis, 29(2007) 586-595.
• Robust stability and a criss-cross algorithm for pseudospectra,
  with Adrian Lewis and Michael Overton, IMA J Num Anal, 23(2003), 359--375.
• Optimization and Pseudospectra, with applications to robust stability,
  with Adrian Lewis and Michael Overton, SIAM Journal on Matrix Analysis and Applications, 25(2003), 80--104.