Geodesic
Some acceleration techniques for calculating the eigenvalues of normal Toeplitz matrices
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 12, pp. 1835-1838 
A. K. Abdikalykov; Kh. D. Ikramov; V. N. Chugunov. Some acceleration techniques for calculating the eigenvalues of normal Toeplitz matrices. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 12, pp. 1835-1838. http://geodesic.mathdoc.fr/item/ZVMMF_2014_54_12_a0/
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     author = {A. K. Abdikalykov and Kh. D. Ikramov and V. N. Chugunov},
     title = {Some acceleration techniques for calculating the eigenvalues of normal {Toeplitz} matrices},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1835--1838},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2014_54_12_a0/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Certain techniques that can be used for accelerating the calculation of the eigenvalues of normal Toeplitz matrices are described. The run times of the standard Matlab procedure eig with and without the use of these techniques are compared.

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[2] Ikramov X. D., “Ob unitarnom podobii ermitovykh teplitsevykh matrits veschestvennym $(T+H)$-matritsam”, Zh. vychisl. matem. i matem. fiz., 34:2 (1994), 301–305

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