ETHZ (Switzerland), Bern University (Switzerland), Granada University (Spain), IPN Lyon (France), Sheffield University (UK), Cryogenic department, Southampton University (UK) Institut Luft und Kältetechnik (ILK) Dresden (Germany) INR Moscow (Russia), INP Krakow (Poland), US Katowice (Poland), UPS Warszawa (Poland), UW Warszawa (Poland), UW Wroclaw (Poland)