An angle metric through the notion of Grassmann representative. Kalogeropoulos, Grigoris I.; Karageorgos, Athanasios D.; Pantelous, Athanasios A. — 2009 ELA. The Electronic Journal of Linear Algebra [electronic only]
Discretizing LTI descriptor (Regular) differential input systems with consistent initial conditions. Karageorgos, Athanasios D.; Pantelous, Athanasios A.; Kalogeropoulos, Grigoris I. — 2010 Advances in Decision Sciences
The Drazin inverse through the matrix pencil approach and its application to the study of generalized linear systems with rectangular or square coefficient matrices. Kalogeropoulos, Grigoris I.; Karageorgos, Athanasios D.; Pantelous, Athanasios A. — 2008 ELA. The Electronic Journal of Linear Algebra [electronic only]
Higher-order linear matrix descriptor differential equations of Apostol-Kolodner type. Kalogeropoulos, Grigoris I.; Karageorgos, Athanasios D.; Pantelous, Athanasios A. — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]
Solution properties of linear descriptor (singular) matrix differential systems of higher order with (non-) consistent initial conditions. Pantelous, Athanasios A.; Karageorgos, Athanasios D.; Kalogeropoulos, Grigoris I.; Arvanitis, Kostas G. — 2010 Abstract and Applied Analysis