@article{amos:1977:acs,
    author = {Amos, D. E. and Daniel, S. L. and Weston, M. K.},
     title = {Algorithm 511: {CDC} 6600 subroutines {IBESS} and {JBESS} for {B}essel
              functions $I_\nu(x)$ and $J_\nu(x)$, $x \geq 0$, $\nu \geq 0$},
   journal = {ACM Trans. Math. Software},
    volume = {3},
      year = {1977},
    number = {1},
     pages = {93–95},
      issn = {0098-3500},
      note = {Single-precision Fortran, maximum accuracy 16S.},
       doi = {10.1145/355719.355727},
     links = {\URL[Companion paper]{http://doi.acm.org/10.1145/355719.355726}. \URL[Erratum]{http://doi.acm.org/10.1145/356502.356501}. \GAMSmodule{TOMS}{511}{8553}}}