1] mr Rajko Bobovnik FROM RECYCLED POLYPROPYLENE TO ENGINEERING PLASTIC COMPOSITE VIA ADDITION OF WASTE PAPER " - Contemporary Materials 2020 - Savremeni Materijali, 02.07.2020.
(https://ekonferencije.com/sr1/rad/from-recycled-polypropylene-to/5856)

2] mr Rajko Bobovnik SYNTHESIS OF GOLD NANOPARTICLES THROUGH ULTRASONIC SPRAY PYROLYSIS AND ITS APPLICATION IN PRINTED ELECTRONICS " - Contemporary Materials 2017 - Savremeni Materijali, 17.07.2017.
(https://ekonferencije.com/sr1/rad/synthesis-of-gold-nanoparticle/5289)