@article{JLT_1999_9_2_a14,
     author = {T. Branson},
     title = {Spectra of {Self-Gradients} on {Spheres}},
     journal = {Journal of Lie theory},
     pages = {491--506},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/JLT_1999_9_2_a14/}
}