This pdf file made by latex+dvips+ps2pdf, the source code is lost or hidden by the creators :)
If the adobe pdf reader to highlight text and copy somewhere, copied kryakozyabry, such as "Ñòîõàñòè÷åñêèé".
As a result of bad coding not working, e.g. search by file.
For some of the existing files helps to use foxit instead of adobe for search, but I want any reader could read. Required, apparently, to change the encoding to something inside (or outside?) pdf. Rummaged in the Internet, nothing useful found, though the problem, like, not rare. Advise any software or sequence of actions to fix it. Any operational system.