@article{,
      recid = {33358},
      title = {Effects of sewage sludge on the cadmium and zinc content  of crops /},
      publisher = {Municipal Environmental Research Laboratory, Office of  Research and Development, U.S. Environmental Protection  Agency,},
      address = {Cincinnati, Ohio :},
      number = {EPA-600/8-81-003},
      pages = {ix, 81 p. :},
      year = {1981},
      note = {"February 1981."},
      url = {http://library.usi.edu/record/33358},
}