(Principles of Telecommunications), written by Miroslav L. Dukić , is a foundational academic textbook widely used in the Balkan region for university courses in telecommunications and electrical engineering.

| Source | What it provides | |--------|------------------| | | Borrow the latest edition. Many university libraries offer digital lending for a few hours or days. | | Google Books / limited preview | Sometimes older editions have partial previews – enough to see page 18 or chapter 18 contents. | | Author’s or publisher’s website | Check if Akademska misao (the publisher) has released sample chapters. | | Course Moodle / Canvas | Your professor may legally upload excerpts (fair use for education). | | Second-hand bookstores | KupujemProdajem, Limundo, or local Facebook groups – buy a used copy cheaply. | | Library Genesis (LibGen) caution | Although many students use it, it is illegal and exposes you to malware. Not recommended. |

School of Electrical Engineering, University of Belgrade (ETF):

If you are searching for page 18 of a PDF, that likely falls into the first or second chapter, which covers – specifically:

Entropy, channel capacity, and coding efficiency. 🔍 Understanding "PDF 18"

[ P = \lim_T \to \infty \frac1T \int_-T/2^T/2 |x(t)|^2 dt ]