1. S.L. Campbell, Singular Systems of Differential Equations, vol. 1 (Pitman, San Francisco, 1980), vol. 2 (1982)
2. H.-W. Cheng, S.S.-T. Yau, More explicit formulas for the matrix exponential. Linear Algebra Appl. 262, 131–163 (1997)
3. L. Dai, Singular control systems, in Lecture Notes in Control and Information Sciences, ed. by M. Thoma, A. Wyner (1988)
4. I.K. Dassios, Homogeneous linear matrix difference equations of higher order: regular case. Bull. Greek Math. Soc. 56, 57–64 (2009)
5. I.K. Dassios, Solutions of higher-order homogeneous linear matrix differential equations for consistent and non-consistent initial conditions: regular case. ISRN Math. Anal. 2011, 183795 (2011) (14 pp.)