Geodesic
A constructive proof of the Chang-Marshall theorem
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part XIV, Tome 141 (1985), pp. 149-153

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In the paper one gives constructive proofs (without the use of the space of maximal ideals of the algebra $H^{\infty}$) of the Marshall-Chang theorem and of a theorem of T. H. Wolff. These theorems are proved in the paper in a unique manner with the use of a lemma which connects the level lines of a positive harmonic function in a circle with the level lines of the inner function. 
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     author = {A. L. Vol'berg},
     title = {A constructive proof of the {Chang-Marshall} theorem},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {149--153},
     publisher = {mathdoc},
     volume = {141},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_141_a7/}
}
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A. L. Vol'berg. A constructive proof of the Chang-Marshall theorem. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part XIV, Tome 141 (1985), pp. 149-153. http://geodesic.mathdoc.fr/item/ZNSL_1985_141_a7/