1] Ivan Žarković EFFECT OF SEASON AND CATEGORY ON UTERINE WEIGHT REACHING SEXUAL MATURITY IN GILTS" - II međunarodni simpozijum i 18-to naučno-stručno savjetovanje agronoma Republike Srpske, 18.02.2013.
(https://ekonferencije.com/sr1/rad/effect-of-season-and-category-/2028)

2] Ivan Žarković EFFECT OF SEASON AND CATEGORY ON UTERINE WEIGHT REACHING SEXUAL MATURITY IN GILTS" - II međunarodni simpozijum i 18-to naučno-stručno savjetovanje agronoma Republike Srpske, 18.02.2013.
(https://ekonferencije.com/sr1/rad/effect-of-season-and-category-/2027)