  In this paper we establish several relations between the determinants of the
following structured matrices: Hankel matrices, symmetric Toeplitz + Hankel
matrices and Toeplitz matrices. Using known results for the asymptotic behavior
of Toeplitz determinants, these identities are used in order to obtain
Fisher-Hartwig type results on the asymptotics of certain skewsymmetric
Toeplitz determinants and certain Hankel determinants.
