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. Milena Ćosić, Tehnikum Taurunum, College of Mechanical Engineering, Serbia
2. Mirjana Stojanovic, Serbia