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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. Rajko Radonjić, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
2. Dragoljub Radonjić, 3. Aleksandra Janković, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia