1] Branko Predojević MEASUREMENT OF RADON LEVELS IN AIR USING THE PASSIVE METHOD BASED ON THE ELECTRET TECHNIQUE AND THE ACTIVE METHOD BASED ON THE DEVICE RAD7" - Contemporary Materials 2021 - Savremeni materijali, 10.08.2021.
(https://ekonferencije.com/en/paper/measurement-of-radon-levels-in/6015)