@article{walker:1991:idg,
    author = {Walker, Peter L.},
     title = {Infinitely differentiable generalized logarithmic and
              exponential functions},
   journal = {Math. Comp.},
  fjournal = {Mathematics of Computation},
    volume = {57},
      year = {1991},
    number = {196},
     pages = {723–733},
      issn = {0025-5718},
     coden = {MCMPAF},
   mrclass = {33E99 (65Q05)},
  mrnumber = {MR1094963 (92d:33049)},
mrreviewer = {F. W. J. Olver},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0025-5718%28199110%2957%3A196%3C723%3AIDGLAE%3E2.0.CO%3B2-B}},
       doi = {10.2307/2938713},
     zblno = {0742.39005}}