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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. Đenđi Vaštag, Serbia
2. Suzana Apostolov, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Serbia
3. Milan Vraneš, Serbia
4. Slobodan Gadzuric, Faculty of Sciences, University of Novi Sad, , Serbia
Applied paper from author