@article{bell:1980:cof,
    author = {Bell, K. L. and Scott, N. S.},
     title = {{C}oulomb functions (negative energies)},
   journal = {Comput. Phys. Comm.},
  fjournal = {Computer Physics Communications},
    volume = {20},
      year = {1980},
     pages = {447–458},
    number = {3},
      note = {Double-precision Fortran code.},
       doi = {10.1016/0010-4655(80)90022-3},
     links = {\URL[Code]{http://www.cpc.cs.qub.ac.uk/summaries/AANB}}}