Вступ до фаху ...

Click https://mentor.khai.edu/pluginfile.php?file=%2F137261%2Fmod_folder%2Fcontent%2F0%2F%D0%90%D0%B1%D0%B8%D0%B1%D0%BE%D0%B2%20-%20%D0%A2%D0%B5%D1%85%D0%BD%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F%20%D1%81%D0%B0%D0%BC%D0%BE%D0%BB%D0%B5%D1%82%D0%BE%D1%81%D1%82%D1%80%D0%BE%D0%B5%D0%BD%D0%B8%D1%8F.djvu&forcedownload=1 link to open resource.