1. mr Zeljka Kojic (2019) "THE EFFICIENCY OF HYDROGEN PEROXIDE IN BLEACHING VITAL TEETH" - Contemporary Materials 2019 - Савремени Материјали
(https://ekonferencije.com/sr/rad/the-efficiency-of-hydrogen-per/5725)

2. mr Zeljka Kojic (2017) "Antimicrobial agents in the treatment of oral cavity disease" - Contemporary Materials 2017 - Савремени Материјали
(https://ekonferencije.com/sr/rad/antimicrobial-agents-in-the-tr/5496)

3. mr Zeljka Kojic (2017) "Antimikrobna i dijagnostička primjena nanočestica zlata u stomatologiji" - Contemporary Materials 2017 - Савремени Материјали
(https://ekonferencije.com/sr/rad/antimikrobna-i-dijagnosticka-p/5296)

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

5. mr Zeljka Kojic (2015) "Efficiency of subgingival glycine powder air-polishing in eradicating putative periodontal pathogens" - Contemporary Materials 2015 - Савремени Материјали
(https://ekonferencije.com/sr/rad/efficiency-of-subgingival-glyc/3766)