@article{koekoek:1998:dsl,
    author = {Koekoek, J. and Koekoek, R. and Bavinck, H.},
     title = {On differential equations for {S}obolev-type {L}aguerre
              polynomials},
   journal = {Trans. Amer. Math. Soc.},
  fjournal = {Transactions of the American Mathematical Society},
    volume = {350},
      year = {1998},
    number = {1},
     pages = {347–393},
      issn = {0002-9947},
     coden = {TAMTAM},
   mrclass = {33C45 (34A35)},
  mrnumber = {MR1433121 (98d:33003)},
mrreviewer = {Hans W. Volkmer},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0002-9947%28199801%29350%3A1%3C347%3AODEFSL%3E2.0.CO%3B2-%23}},
     zblno = {0886.33006}}