@article{1640189,
      url = {http://digitallibrary.un.org/record/1640189},
      title = {Methods of determining the origin of opium by chemical and  physical means : determination of codeine in the lime-water  extract},
      publisher = {UN,},
      recid = {1640189},
      pages = {18 p.},
      address = {[New York] :. 1950-09-18},
      year = {1950},
      month = {Sep},
}