@article{gautschi:1979:cpi,
    author = {Gautschi, Walter},
     title = {A computational procedure for incomplete gamma functions},
   journal = {ACM Trans. Math. Software},
  fjournal = {Association for Computing Machinery. Transactions on
              Mathematical Software},
    volume = {5},
      year = {1979},
    number = {4},
     pages = {466–481},
      issn = {0098-3500},
       doi = {10.1145/355853.355863},
     zblno = {0429.65011}}