TY - GEN AU - United Nations Environment Programme PY - 1989 UR - https://wedocs.unep.org/handle/20.500.11822/29548 LA - English KW - ozone layer KW - refrigeration KW - air-conditioning KW - heat pump TI - Technical progress on Protecting the Ozone Layer: Refrigeration, Air Conditioning and Heat Pumps Technical Options Report M3 - Communication or other resource ER -