@article{herndon:1961:ace2,
    author = {Herndon, J. R.},
     title = {Algorithm 56: Complete elliptic integral of the second kind},
   journal = {Comm. ACM},
    volume = {4},
      year = {1961},
    number = {4},
     pages = {180–181},
      note = {Includes Algol program, maximum accuracy 8D. For certification see same
              journal {\bf 9} (1966), p.~12},
      issn = {0001-0782},
       doi = {10.1145/355578.366474}}