1. mr Rajko Bobovnik (2020) "FROM RECYCLED POLYPROPYLENE TO ENGINEERING PLASTIC COMPOSITE VIA ADDITION OF WASTE PAPER " - Contemporary Materials 2020 - Savremeni Materijali
(https://ekonferencije.com/sr1/rad/from-recycled-polypropylene-to/5856)

2. mr Rajko Bobovnik (2017) "SYNTHESIS OF GOLD NANOPARTICLES THROUGH ULTRASONIC SPRAY PYROLYSIS AND ITS APPLICATION IN PRINTED ELECTRONICS " - Contemporary Materials 2017 - Savremeni Materijali
(https://ekonferencije.com/sr1/rad/synthesis-of-gold-nanoparticle/5289)