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3. Refrigeranti a basso GWP
http://www.associazioneatf.org/newsletter%20AREA/AREA%20-%20PP%20Low%20GWP%20refrigerants%20(110629)_ITA.pdf
4. The next generation of refrigerants – Historical review, considerations, and outlook
5. Past, present and future perspectives of refrigerants in air-conditioning, refrigeration and heat pump applications;Sârbu;WSEAS Trans. Heat Mass Transf.,2014