1. Mikron Group, official website, www.mikron.com , accessed Oct. 22, 2011.
2. Raytek Corporation, official website, www.raytek.com , accessed Oct. 22, 2011.
3. Termokont Noncommercial Scientific-Technical Partnership, official website, www.pyrometer.ru , accessed Oct. 22, 2011.
4. Testo AG, official website, www.testo.com , accessed Oct. 22, 2011.
5. Diagnost Company, official website, www.diagnost.ru , accessed Oct. 22, 2011.