@article{NSJOM_2004_34_1a_9,
     author = {A. 

 Achache},
     title = {Operateurs de 

 fermeture semi-commutatifs},
     journal = {Novi Sad Journal of Mathematics},
     pages = {79-87},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2004_34_1a_9/}
}