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Protocollo alla convenzione sull'inquinamento atmosferico transfrontaliero a lunga distanza, del 1979, relativo ad un'ulteriore riduzione delle emissioni di zolfo
environ.	1994 Oslo Protocol on Further Reduction of Sulphur Emissions; Protocol to the 1979 Convention on Long-range Transboundary Air Pollution, on Further Reduction of Sulphur Emissions