@article{10_4064_cm117_1_3,
     author = {Soud Khalifa Mohamed},
     title = {Relative theory in subcategories},
     journal = {Colloquium Mathematicum},
     pages = {29--63},
     publisher = {mathdoc},
     volume = {117},
     number = {1},
     year = {2009},
     doi = {10.4064/cm117-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm117-1-3/}
}