@article{landau:1999:rbf,
    author = {Landau, L. J.},
     title = {Ratios of {B}essel functions and roots of {$\alpha J\sb
              \nu(x)+xJ'\sb \nu(x)=0$}},
   journal = {J. Math. Anal. Appl.},
  fjournal = {Journal of Mathematical Analysis and Applications},
    volume = {240},
      year = {1999},
    number = {1},
     pages = {174–204},
      issn = {0022-247X},
     coden = {JMANAK},
   mrclass = {33C10 (33F05)},
  mrnumber = {MR1728198 (2001d:33004)},
mrreviewer = {Boro D{\"o}ring},
       doi = {10.1006/jmaa.1999.6608},
     zblno = {0938.33002}}