@article{morgenthaler:1963:zfd,
    author = {Morgenthaler, George W. and Reismann, Herbert},
     title = {Zeros of first derivatives of {B}essel functions of the first
              kind, {$J\sb{n}'\,(x)$}, {$21\leq n\leq 51$}, {$0\leq x\leq
              100$}},
   journal = {J. Res. Nat. Bur. Standards Sect. B},
  fjournal = {Journal of Research of the National Bureau of Standards},
    volume = {67B},
      year = {1963},
    number = {3},
     pages = {181–183},
      issn = {0160-1741},
   mrclass = {33.25},
  mrnumber = {MR0155021 (27 \#4963)},
     zblno = {0118.12803}}