Geodesic
Exact bounds of denumerable collections of degrees of difficulty
Matematičeskie zametki, Tome 28 (1980) no. 6, pp. 899-910.

Voir la notice de l'article provenant de la source Math-Net.Ru

@article{MZM_1980_28_6_a8,
     author = {E. Z. Dyment},
     title = {Exact bounds of denumerable collections of degrees of difficulty},
     journal = {Matemati\v{c}eskie zametki},
     pages = {899--910},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_6_a8/}
}
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E. Z. Dyment. Exact bounds of denumerable collections of degrees of difficulty. Matematičeskie zametki, Tome 28 (1980) no. 6, pp. 899-910. http://geodesic.mathdoc.fr/item/MZM_1980_28_6_a8/