@article{gautschi:1979:igf,
    author = {Gautschi, W.},
     title = {Algorithm 542: {I}ncomplete gamma functions},
   journal = {ACM Trans. Math. Software},
    volume = {5},
      year = {1979},
    number = {4},
      note = {Single-precision Fortran.},
     pages = {482–489},
      issn = {0098-3500},
       doi = {10.1145/355853.355864},
     links = {\GAMSmodule{TOMS}{542}{8581}},
     zblno = {0434.65007}}