Local and global invariants of linear differential-algebraic equations and their relation. Kunkel, Peter; Mehrmann, Volker — 1996 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Characterization of classes of singular linear differential-algebraic equations. Kunkel, Peter; Mehrmann, Volker — 2005 ELA. The Electronic Journal of Linear Algebra [electronic only]
Stability properties of differential-algebraic equations and Spin-stabilized discretizations. Kunkel, Peter; Mehrmann, Volker — 2007 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Formal adjoints of linear DAE operators and their role in optimal control. Kunkel, Peter; Mehrmann, Volker — 2011 ELA. The Electronic Journal of Linear Algebra [electronic only]