Dragoslav Herceg’s works are still under copyright protection. The booklet is officially published by Fakultet tehničkih nauka (FTN) in Novi Sad or other Serbian publishers. While many students share scanned copies, a "full" PDF obtained through unofficial channels may be a pirated copy. If you need it for serious study, consider purchasing a physical copy—they are inexpensive (usually under €10) and support local academic authors.
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