@article{SIGMA_2021_17_a15,
     author = {Mar{\'\i}a \'Angeles Garc{\'\i}a-Ferrero and David G\'omez-Ullate and Robert Milson},
     title = {Exceptional {Legendre} {Polynomials} and {Confluent} {Darboux} {Transformations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a15/}
}