@article{IJAMCS_2001_11_3_a4,
     author = {Mousavi, A. and Jabedar-Maralani, P.},
     title = {Relative {Sets} and {Rough} {Sets}},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {637--653},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_3_a4/}
}