ELA, Volume 5, pp. 67-103, May 1999, abstract.


Structured Jordan Canonical Forms for Structured Matrices that are Hermitian, 
Skew Hermitian or Unitary with Respect to Indefinite Inner Products

Volker Mehrmann and Hongguo Xu


For inner products defined by an indefinite sign matrix, canonical forms 
for real or complex Hermitian, skew Hermitian and unitary matrices are 
studied under equivalence transformations which keep the class invariant.