@article{10_1090_S1079_6762_98_00050_X,
     author = {Mackenzie, K.},
     title = {Drinfel\^a€™d doubles and {Ehresmann} doubles for {Lie} algebroids and {Lie} bialgebroids},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {74--87},
     publisher = {mathdoc},
     volume = {04},
     year = {1998},
     doi = {10.1090/S1079-6762-98-00050-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-98-00050-X/}
}