1. Maratou A, Skačanová K, Vanaga G. HFC taxes & fiscal incentives for natural refrigerants in Europe. Shecco publications, December 2013.
2. EU Regulation No 517/2014 of The European Parliament and of The Council of 16 April 2014 on fluorinated greenhouse gases and repealing Regulation (EC) No 842/2006. 20 May 2014.
3. Coulomb D. The challenges in the refrigeration and air conditioning industry. 15th European Conference “Latest technologies in refrigeration and air conditioning”. Politecnico di Milano - Milano 7th-8th June 2013.
4. Wolfram Jörß, Öko-Institut. Symposium “Die neue EU-F-Gase-Verordnung: Auswirkungen auf den Kälte-Klimasektor und den Dämmstoffmarkt”. Sindelfingen, 29th March 2014.
5. Schmidt SL. Klö Cker K. Flacke N. Steimle F. Applying the CO2 transcitical process to a drying heat pump. Int. J Refrigeration 1998; 21:202-211.