Geodesic
An example of a $U$-set for the Walsh system
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1982), pp. 53-55 
V. A. Skvortsov. An example of a $U$-set for the Walsh system. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1982), pp. 53-55. http://geodesic.mathdoc.fr/item/VMUMM_1982_5_a14/
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     author = {V. A. Skvortsov},
     title = {An example of a $U$-set for the {Walsh} system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {53--55},
     year = {1982},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_5_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that there exists a closed $U$-set for the Walsh series which is in a sense “thick”.