@article{gil:2003:czt,
    author = {Gil, Amparo and Segura, Javier},
     title = {Computing the zeros and turning points of solutions of second
              order homogeneous linear {ODE}s},
   journal = {SIAM J. Numer. Anal.},
  fjournal = {SIAM Journal on Numerical Analysis},
    volume = {41},
      year = {2003},
    number = {3},
     pages = {827–855},
      issn = {0036-1429},
   mrclass = {65H05 (33C05 34C10 34E20)},
  mrnumber = {MR2005184 (2004h:65044)},
       doi = {10.1137/S0036142901392754},
     zblno = {1056.65049}}