[1] Born in Pula, a native of Zadar, Dujella took part in the International Mathematical Olympiad, where he won a bronze medal in 1984.
and Ph.D. in mathematics from the University of Zagreb with a dissertation titled "Generalized Diophantine–Davenport problem".
Dujella's main contribution to number theory is in connection to Diophantine m-tuples.
[3][4][5] He applied Diophantine tuples to construct elliptic curves with high rank.
[6] In 1998, Dujella and Attila Pethő introduced congruence method to obtain lower bound for number of Diophantine 5-tuples.