@article{SIGMA_2008_4_a34,
     author = {Mohamed Maghfoul},
     title = {Relative differential $K$-characters},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a34/}
}