Piatkowski, Tadeusz     Examination of metallic surfaces for IR gray body sources [Текст] / Tadeusz Piatkowski, Henryk Polakowski, Natalia Hots // Qirt 2008 : Quantitative infrared thermography : 9th International conference, July 2-5, 2008, Krakow , Poland / Institute of electronics of the Technical university of Lodz, Poland and Universitety of science and technology , Krakow, Poland. — Krakow, 2008. — P. 185-190.