With more than 71,000 Serbian citizens returning to the country, primarily from Germany, Austria, Italy, and France, the government has introduced systems to ensure they obey the country's self-isolation rules. The government monitors telephone numbers, especially Italian ones, and pays special attention to communities with a large influx of people from elsewhere.
https://advox.globalvoices.org/2020/03/30/covid-19-pandemic-adversely-affects-digital-rights-in-the-balkans/#
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