@article{JLT_2010_20_1_JLT_2010_20_1_a4,
     author = {C. Righi and R. W. T. Yu },
     title = {On the {Index} of the {Quotient} of a {Borel} {Subalgebra} by an {ad-Nilpotent} {Ideal}},
     journal = {Journal of Lie theory},
     pages = {49--63},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JLT_2010_20_1_JLT_2010_20_1_a4/}
}