@article{yohe:1979:sia,
    author = {Yohe, J. M.},
     title = {Software for interval arithmetic: A reasonably portable package},
   journal = {ACM Trans. Math. Software},
  fjournal = {Association for Computing Machinery. Transactions on
              Mathematical Software},
    volume = {5},
      year = {1979},
    number = {1},
     pages = {50–63},
      issn = {0098-3500},
       doi = {10.1145/355815.355819}}