@article{701755,
     title = {Hasse graphs and parabolic subalgebras of exceptional Lie algebra $f\_4$
               },
     booktitle = {Proceedings of the 24th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2005},
     pages = {[293]-308},
     mrnumber = {MR2152368},
     zbl = {1102.22012},
     url = {http://dml.mathdoc.fr/item/701755}
}

Somberg, Petr. Hasse graphs and parabolic subalgebras of exceptional Lie algebra $f_4$
               , dans Proceedings of the 24th Winter School "Geometry and Physics", GDML_Books,  (2005), pp. [293]-308. http://gdmltest.u-ga.fr/item/701755/