@misc{MehlMehrmannRanetal.2009, author = {Christian Mehl and Volker Mehrmann and Andre Ran and Leiba Rodman}, title = {Perturbation theory of selfadjoint matrices and sign characteristics under generic structured rank one perturbations}, institution = {Technische Universit{\"a}t Berlin}, type = {preprintmatheon}, year = {2009}, }