1] dr Željka Kojić " - Contemporary Materials 2025 - Savremeni Materijali, 27.07.2025.
(https://ekonferencije.com/sr1/rad//6703)

2] dr Željka Kojić The influence of oral hygiene and dietary habits on the success of the bleaching of endodontically treated teeth" - Contemporary Materials 2025 - Savremeni Materijali, 18.07.2025.
(https://ekonferencije.com/sr1/rad/the-influence-of-oral-hygiene-/6697)

3] dr Željka Kojić EFFICACY OF SODIUM LAURYL SULFATE FREE TOOTHPASTE IN REDUCING THE FEELING OF DRY MOUTH" - Contemporary Materials 2020 - Savremeni Materijali, 26.08.2020.
(https://ekonferencije.com/sr1/rad/efficacy-of-sodium-lauryl-sulf/5926)

4] dr Željka Kojić EFFICACY OF PLATELET -RICH FINRIN (PRF) IN DONOR SOTE HEALING AFTER REMOVEL OF FREE GINGIVAL GRAFT (FGG)" - Contemporary Materials 2019 - Savremeni Materijali, 08.07.2019.
(https://ekonferencije.com/sr1/rad/efficacy-of-platelet--rich-fin/5726)