@article{SM_2006_197_11_a3,
     author = {Yu. A. Neretin},
     title = {Perturbations of {Jacobi} polynomials},
     journal = {Sbornik. Mathematics},
     pages = {1607--1633},
     year = {2006},
     volume = {197},
     number = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_11_a3/}
}