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The phrase appears to be a misencoded version of the Russian phrase "Статьи на тему: 'pes'" , which translates to "Articles on the topic: 'pes'" . This specific wording is frequently found as a heading on Russian-language websites, blogs, or forums.
Depending on the context of the articles you are looking for, "PES" typically refers to one of the following: What are PES? A review of definitions and an extension Статьи на тему: "pes"