@article{SIGMA_2017_13_a6,
     author = {Matthew Burke},
     title = {Connected {Lie} {Groupoids} are {Internally} {Connected} and {Integral} {Complete} in {Synthetic} {Differential} {Geometry}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2017},
     volume = {13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2017_13_a6/}
}