1] Sonja Ketin DEVELOPMENT AND APPLICATION OF BIOTECHNOLOGIES IN THE FUNCTION OF IMPROVING AGRICULTURAL PRODUCTION" - Contemporary Materials 2024 - Savremeni Materijali, 26.08.2024.
(https://ekonferencije.com/sr1/rad/development-and-application-of/6655)

2] Sonja Ketin BIOLOGICAL MATERIALS (DNA) - PROJECTS AND CHALLENGES IN THE WORLD" - Contemporary Materials 2024 - Savremeni Materijali, 26.08.2024.
(https://ekonferencije.com/sr1/rad/biological-materials-dna---pro/6654)

3] Sonja Ketin GENETIC ENGINEERING IN THE FUNCTION OF BIOLOGICAL WAR ON A GLOBAL SCALE AND ENVIRONMENTAL SAFETY MEASURES" - Contemporary Materials 2021 - Savremeni materijali, 03.09.2021.
(https://ekonferencije.com/sr1/rad/genetic-engineering-in-the-fun/6028)

4] Sonja Ketin FUTURE OF TECHNOLOGY OF POLYMERIZATION PRODUCTION (POLYPROPYLENE)" - Contemporary Materials 2019 - Savremeni Materijali, 01.08.2019.
(https://ekonferencije.com/sr1/rad/future-of-technology-of-polyme/5797)