@article{SIGMA_2015_11_a60,
     author = {Yves Grandati and Christiane Quesne},
     title = {Confluent {Chains} of {DBT:} {Enlarged} {Shape} {Invariance} and {New} {Orthogonal} {Polynomials}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2015},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a60/}
}