@article{188138,
      url = {http://digitallibrary.un.org/record/188138},
      title = {Revised draft technical annex to the 1988 Sofia Protocol  on Control Technologies for NOx Emissions from Mobile  Sources (part 2) concerning the control of NOx emissions  from heavy-duty vehicles /},
      publisher = {UN,},
      recid = {188138},
      pages = {7 p. :},
      address = {Geneva :. 1994-07-27},
      year = {1994},
      month = {Jul},
}