The article talks about Roadside Picnic, the Russian sci-fi novel where the Stalker term was coined. I learned about this book on HN and highly recommend it.
One of the brothers - Arkady - worked as a translator in the Far East in the beginning of 195x. The large areas on the border there were deeply and strongly fortified areas of Japan Kwantung army which USSR defeated in 1945. The motif of the dangerous zone full of hazards can be traced in the Strugatskies' works from the earlier short stories where the events directly happen at those Kwantung army fortifications to the abstracted Zone in the "Roadside Picnic" and the forest booby-trapped with automated weapons in the "The Inhabited Island".