@article{SIGMA_2014_10_a71,
     author = {Andrew Douglas and Joe Repka},
     title = {The {GraviGUT} {Algebra} {Is} not {a~Subalgebra} of $E_8$, but $E_8$ {Does} {Contain} an {Extended} {GraviGUT} {Algebra}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2014},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a71/}
}