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. Ana Kramar, Serbia
2. Jovana Milanović, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Srbija, Serbia