@article{amos:1980:cei,
    author = {Amos, Donald E.},
     title = {Computation of exponential integrals},
   journal = {ACM Trans. Math. Software},
  fjournal = {Association for Computing Machinery. Transactions on
              Mathematical Software},
    volume = {6},
      year = {1980},
    number = {3},
     pages = {365–377},
      issn = {0098-3500},
     coden = {ACMSCU},
   mrclass = {65D30 (68-04)},
  mrnumber = {MR0585343 (82b:65011)},
mrreviewer = {M. M. Chawla},
       doi = {10.1145/355900.355908},
     zblno = {0436.65006}}