1] mr Zeljka Kojic THE EFFICIENCY OF HYDROGEN PEROXIDE IN BLEACHING VITAL TEETH" - Contemporary Materials 2019 - Savremeni Materijali, 03.07.2019.
(https://ekonferencije.com/sr1/rad/the-efficiency-of-hydrogen-per/5725)

2] mr Zeljka Kojic Antimicrobial agents in the treatment of oral cavity disease" - Contemporary Materials 2017 - Savremeni Materijali, 30.09.2017.
(https://ekonferencije.com/sr1/rad/antimicrobial-agents-in-the-tr/5496)

3] mr Zeljka Kojic Antimikrobna i dijagnostička primjena nanočestica zlata u stomatologiji" - Contemporary Materials 2017 - Savremeni Materijali, 24.07.2017.
(https://ekonferencije.com/sr1/rad/antimikrobna-i-dijagnosticka-p/5296)

4] mr Zeljka Kojic ASSESSMENT OF PERIODONTAL CLINICAL PARAMETERS AFTER APPLICATION OF HYALURONIC ACID –BASED BIOGEL TO PATIENTS WITH CHRONIC PERIODONTITIS" - Contemporary Materials 2016 - Savremeni Materijali, 14.07.2016.
(https://ekonferencije.com/sr1/rad/assessment-of-periodontal-clin/4626)

5] mr Zeljka Kojic Efficiency of subgingival glycine powder air-polishing in eradicating putative periodontal pathogens" - Contemporary Materials 2015 - Savremeni Materijali, 28.05.2015.
(https://ekonferencije.com/sr1/rad/efficiency-of-subgingival-glyc/3766)