@article{olver:1964:eba,
    author = {Olver, F. W. J.},
     title = {Error bounds for asymptotic expansions in turning-point
              problems},
   journal = {J. Soc. Indust. Appl. Math.},
    volume = {12},
      year = {1964},
    number = {1},
     pages = {200–214},
   mrclass = {34.50},
  mrnumber = {MR0163003 (29 \#306)},
mrreviewer = {N. D. Kazarinoff},
       doi = {10.1137/0112019},
     zblno = {0123.04803}}