@article{ARM_2008_44_5_a3,
     author = {Hammerl, Matthias},
     title = {Invariant prolongation of {BGG-operators} in conformal geometry},
     journal = {Archivum mathematicum},
     pages = {367--384},
     year = {2008},
     volume = {44},
     number = {5},
     mrnumber = {2501573},
     zbl = {1212.53014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2008_44_5_a3/}
}