Geodesic
On the radicals of semigroup rings of 2-nilpotent semigroups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 1, pp. 461-466 
G. B. Lungu. On the radicals of semigroup rings of 2-nilpotent semigroups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 1, pp. 461-466. http://geodesic.mathdoc.fr/item/FPM_1998_4_1_a26/
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     author = {G. B. Lungu},
     title = {On the radicals of semigroup rings of 2-nilpotent semigroups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {461--466},
     year = {1998},
     volume = {4},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_1_a26/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The article deals with the properties of radicals of semigroup rings of 2-nilpotent semigroups. A relation between the separative congruence on a 2-nilpotent semigroup and the radicals larger than the prime radical is obtained. There is also obtained a characterisation of the Levitsky and Jacobson radicals for some special classes of semilattices of 2-nilpotent groups.