Geodesic
On the size of the singular set on the boundary of a domain of non-Smirnov type
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 17, Tome 170 (1989), pp. 176-183 
N. G. Makarov. On the size of the singular set on the boundary of a domain of non-Smirnov type. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 17, Tome 170 (1989), pp. 176-183. http://geodesic.mathdoc.fr/item/ZNSL_1989_170_a9/
@article{ZNSL_1989_170_a9,
     author = {N. G. Makarov},
     title = {On the size of the singular set on the boundary of a domain of {non-Smirnov} type},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {176--183},
     year = {1989},
     volume = {170},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_170_a9/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Tumarkin and Shapiro necessary conditions for a Jordan domain to be of Smirnov class are improved.