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United Nations Environment Programme ,  United States National Oceanic and Atmospheric Administration ,  [Scientific Assessment of Ozone Depletion 1994: Executive Summary - Global Ozone Research and Monitoring Project Report No. 37] ,  Scientific Assessment of Ozone Depletion 1994: Executive Summary - Global Ozone Research and Monitoring Project Report No. 37

United Nations Environment Programme ,  [Communication des données sur les HFC en vertu de l'article 7: Quand les états doivent-ils commencer à transmettre ?, Artículo 7 Informes de datos sobre HFC: Fechas en las que los países deben comenzar a informar] ,  [Article 7 Data Reporting on HFCs: When Countries Need to Start Reporting - OzonAction Factsheet] ,  Article 7 Data Reporting on HFCs: When Countries Need to Start Reporting - OzonAction Factsheet