@article{ARM_2008_44_5_a7,
     author = {Landsberg, Joseph M.},
     title = {Exterior differential systems, {Lie} algebra cohomology, and the rigidity of homogenous varieties},
     journal = {Archivum mathematicum},
     pages = {419--447},
     year = {2008},
     volume = {44},
     number = {5},
     mrnumber = {2501577},
     zbl = {1212.53013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2008_44_5_a7/}
}