@article{JLT_2016_26_1_JLT_2016_26_1_a12,
     author = {P. J. Olver},
     title = {The {Symmetry} {Groupoid} and {Weighted} {Signature} of a {Geometric} {Object}},
     journal = {Journal of Lie theory},
     pages = {235--267},
     year = {2016},
     volume = {26},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JLT_2016_26_1_JLT_2016_26_1_a12/}
}