@article{JEMS_2014_16_12_a4,
     author = {Dmitri I. Panyushev},
     title = {Abelian ideals of a {Borel} subalgebra and root systems},
     journal = {Journal of the European Mathematical Society},
     pages = {2693--2708},
     publisher = {mathdoc},
     volume = {16},
     number = {12},
     year = {2014},
     doi = {10.4171/jems/496},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/496/}
}