@article{61383,
      author = {Widder, D. V.},
      url = {http://library.usi.edu/record/61383},
      title = {Advanced calculus.},
      publisher = {Prentice-Hall,},
      recid = {61383},
      pages = {520 p.},
      address = {Englewood Cliffs, N.J.,},
      year = {1961},
}