Geodesic
The problem of gray boxes
Matematičeskie zametki, Tome 47 (1990) no. 1, pp. 3-14 
S. Kh. Aranson. The problem of gray boxes. Matematičeskie zametki, Tome 47 (1990) no. 1, pp. 3-14. http://geodesic.mathdoc.fr/item/MZM_1990_47_1_a0/
@article{MZM_1990_47_1_a0,
     author = {S. Kh. Aranson},
     title = {The problem of gray boxes},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--14},
     year = {1990},
     volume = {47},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_1_a0/}
}
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