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Severity: Notice
Message: Undefined offset: 0
Filename: controllers/presentation.php
Line Number: 875
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/presentation.php
Line Number: 875
Author(s):
1. Nemanja Stojanović, Fakultet tehničkih nauka u Čačku Univerziteta u Kragujevcu, Serbia
2. Aleksandra Janićijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Serbia
3. Aco Janicijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Srbija, Serbia