Geodesic
Closure of basic role DP-model
Prikladnaâ diskretnaâ matematika, no. 10 (2009), pp. 41-44 
M. A. Kachanov. Closure of basic role DP-model. Prikladnaâ diskretnaâ matematika, no. 10 (2009), pp. 41-44. http://geodesic.mathdoc.fr/item/PDM_2009_10_a20/
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     author = {M. A. Kachanov},
     title = {Closure of basic role {DP-model}},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {41--44},
     year = {2009},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2009_10_a20/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Two kinds of access graph closure are defined here for the role DP-model, and algorithms for the construction of them are suggested in the paper. The results are aimed to verify for all the users, entities and access rights simultaneously if the predicate $can\_share()$ is true meaning the possibility of taking ownership access rights of a trusted subject by an untrusted subject in a computer system with discretionary access and information stream management.

[1] Devyanin P. N., “Bazovaya rolevaya DP-model”, Prikladnaya diskretnaya matematika, 2008, no. 1, 64–70