@article{CTGDC_1987__28_1_29_0,
     author = {Mackenzie, Kirill},
     title = {Integrability obstructions for extensions of {Lie} algebroids},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {29--52},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {1},
     year = {1987},
     mrnumber = {903150},
     zbl = {0626.57015},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1987__28_1_29_0/}
}