@article{JOLT_2004_14_2_a3,
     author = {R. Ghanam and G. Thompson and E. J. Miller},
     title = {Variationality of {Four-Dimensional} {Lie} {Group} {Connections

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     journal = {Journal of Lie Theory},
     pages = {395--425},
     year = {2004},
     volume = {14},
     number = {2},
     zbl = {1288.70011},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a3/}
}