Zero optimized tracking for linear continuous-time systems. - Gísli Herjólfsson; Bergþór Ævarsson; Anna Soffía Hauksdóttir; Sven P. Sigurosson (ACC, 2005)

Closed form ℒ2/ℋ2-optimising of zeros for model reduction of linear continuous time systems. - Gísli Herjólfsson; Bergþór Ævarsson; Anna Soffía Hauksdóttir; Sven Þ. Sigurðsson (Int. J. Control, 2009)