@article{SIGMA_2015_11_a89,
     author = {Andrew James Bruce and Katarzyna Grabowska and Janusz Grabowski},
     title = {Graded {Bundles} in the {Category} of {Lie} {Groupoids}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2015},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a89/}
}