@article{BSMF_2019__147_3_443_0,
     author = {Wagner, Stefan},
     title = {Secondary characteristic classes of {Lie} algebra extensions},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {443--453},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {147},
     number = {3},
     year = {2019},
     doi = {10.24033/bsmf.2788},
     mrnumber = {4030546},
     zbl = {1468.17029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.24033/bsmf.2788/}
}