Let E(p)x˙ = A(p)x + B(p)u be a family of singular linear systems smoothly dependent on a vector of
real parameters p = (p1, . . . , pn). In this work we construct versal deformations of the given differentiable family
under an equivalence relation, providing a special parametrization of space of systems, which can be effectively
applied to perturbation analysis. Furthermore in particular, we study the behavior of a simple eigenvalue of a
singular linear system family E(p)x˙ = A(p)x + B(p)u.
Garcia-Planas, M.I.; Tarragona, S. Analysis of behavior of the eigenvalues and eigenvectors of singular linear systems. "WSEAS transactions on mathematics", 2012, vol. 11, núm. 11, p. 957-965.