Nonnegativity of uncertain polynomials. Šiljak, Dragoslav D., Šiljak, Matija D. (1998) Mathematical Problems in Engineering
Norms of certain rational functions of a matrix and Schur's criterion for polynomials N. J. Young (1978) Commentationes Mathematicae Universitatis Carolinae
Note on stability of a linear homogeneous control system Jan Kučera, Ivo Vrkoč (1970) Časopis pro pěstování matematiky
Numerical Solution of Bifurcation Problems for Ordinary Differential Equations. W.F. Langford (1977) Numerische Mathematik