1. Nikolay Panayotov (2013) "ASSESSMENT OF YIELD AND STABILITY OF PERSPECTIVE BULGARIAN BREEDING LINES PEPPER WITH CONIC SHAPE" - II međunarodni simpozijum i 18-to naučno-stručno savjetovanje agronoma Republike Srpske
(https://ekonferencije.com/sr1/rad/assessment-of-yield-and-stabil/2096)

2. Nikolay Panayotov (2013) "ASSESSMENT OF YIELD AND STABILITY OF PERSPECTIVE BULGARIAN BREEDING LINES PEPPER WITH CONIC SHAPE" - II međunarodni simpozijum i 18-to naučno-stručno savjetovanje agronoma Republike Srpske
(https://ekonferencije.com/sr1/rad/assessment-of-yield-and-stabil/2094)