@article{243708,
      url = {http://digitallibrary.un.org/record/243708},
      title = {Technical and ecological norms required for the  determination of efficiency of use of household gas  installations : replies to the questionnaire /},
      publisher = {UN,},
      recid = {243708},
      pages = {10 p.},
      address = {Geneva :. 1997-05-30},
      year = {1997},
      month = {May},
}