@article{SIGMA_2016_12_a48,
     author = {Erik A. van Doorn},
     title = {Shell {Polynomials} and {Dual} {Birth-Death} {Processes}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2016},
     volume = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a48/}
}