Geodesic
On a theorem of G. Szegö
Matematičeskie zametki, Tome 3 (1968) no. 6, pp. 693-702 
I. A. Ibragimov. On a theorem of G. Szegö. Matematičeskie zametki, Tome 3 (1968) no. 6, pp. 693-702. http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a8/
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     author = {I. A. Ibragimov},
     title = {On a~theorem of {G.~Szeg\"o}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {693--702},
     year = {1968},
     volume = {3},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that the precise result of G. Szegö on the asymptotic behavior of the Toeplitz determinants $D_n(f)$, generated by the nonnegative summable function of $f(\lambda)$ holds if $\ln f\in L_1(-\pi,\pi)$.