Geodesic
Necessary and sufficient conditions for the existence of boundary values of the modulus of a~function that is bounded and analytic in a~half-plane
Izvestiya. Mathematics , Tome 25 (1985) no. 1, pp. 89-114

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Necessary and sufficient conditions are obtained for the existence of a nontangential limit and of a limit along the normal at a particular point of the boundary for the modulus of a function that is bounded and analytic in a half-plane; the conditions consist in the existence at this point of the derivative and of the symmetric derivative, respectively, of the mass distribution function. Bibliography: 14 titles 
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     author = {A. P. Mul},
     title = {Necessary and sufficient conditions for the existence of boundary values of the modulus of a~function that is bounded and analytic in a~half-plane},
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     url = {http://geodesic.mathdoc.fr/item/IM2_1985_25_1_a5/}
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A. P. Mul. Necessary and sufficient conditions for the existence of boundary values of the modulus of a~function that is bounded and analytic in a~half-plane. Izvestiya. Mathematics , Tome 25 (1985) no. 1, pp. 89-114. http://geodesic.mathdoc.fr/item/IM2_1985_25_1_a5/