@article{174740,
      url = {http://digitallibrary.un.org/record/174740},
      title = {Revised draft technical annex to the 1988 Sofia Protocol.  Introduction and part 1, Control technologies for NOx  emissions from stationary sources.},
      publisher = {UN,},
      recid = {174740},
      pages = {12 p. :},
      address = {Geneva :. 1993-07-20},
      year = {1993},
      month = {Jul},
}