@article{JLT_2015_25_3_JLT_2015_25_3_a9,
     author = {T. Backhaus and C. Desczyk},
     title = {PBW {Filtration:} {Feigin-Fourier-Littelmann} {Modules} {Via} {Hasse} {Diagrams}},
     journal = {Journal of Lie theory},
     pages = {815--856},
     year = {2015},
     volume = {25},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/JLT_2015_25_3_JLT_2015_25_3_a9/}
}