Reachability indices of positive linear systems. Bru, Rafael; Coll, Carmen; Romero, Sergio; Sánchez, Elena — 2004 ELA. The Electronic Journal of Linear Algebra [electronic only]
An upper bound of the reachability index for a special class of positive 2-D systems. Bailo, Esteban; Gelonch, Josep; Romero-Vivo, Sergio — 2009 ELA. The Electronic Journal of Linear Algebra [electronic only]