Geodesic
On the eigenvalues of certain classes of normal Toeplitz-plus-Hankel matrices
Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXVIII, Tome 439 (2015), pp. 5-12 
A. K. Abdikalykov; Kh. D. Ikramov. On the eigenvalues of certain classes of normal Toeplitz-plus-Hankel matrices. Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXVIII, Tome 439 (2015), pp. 5-12. http://geodesic.mathdoc.fr/item/ZNSL_2015_439_a0/
@article{ZNSL_2015_439_a0,
     author = {A. K. Abdikalykov and Kh. D. Ikramov},
     title = {On the eigenvalues of certain classes of normal {Toeplitz-plus-Hankel} matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--12},
     year = {2015},
     volume = {439},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_439_a0/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Certain classes of normal Toeplitz-plus-Hankel matrices whose eigenvalues can be computed as efficiently as those of circulants are indicated.