Geodesic
A Note on Exact Sequences
Bulletin of the Malaysian Mathematical Society, Tome 22 (1999) no. 1 
B. Davvaz; Y.A. Parnian-Garamaleky. A
                          Note on Exact Sequences. Bulletin of the Malaysian Mathematical Society, Tome 22 (1999) no. 1. http://geodesic.mathdoc.fr/item/BMMS_1999_22_1_a5/
@article{BMMS_1999_22_1_a5,
     author = {B. Davvaz and Y.A. Parnian-Garamaleky},
     title = {A
                          {Note} on {Exact} {Sequences}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {1999},
     volume = {22},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_1999_22_1_a5/}
}
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Voir la notice de l'article provenant de la source BMMS

In this paper a new notion of an exact sequence is introduced which is called U -exact sequence. Some interesting results concerning this concept are proved.