"Electronic Tour Guide — The handmade business", www.siliconrus.com, (Russian)
"Prague electronic guides can be rented ", www.travel.ru, (Russian)
"Pocket guide help to explore the city by yourself", www.pragu.ru, (Russian)
"Desktop Silicon Valley. The story of creating a home-brew electronic device and business from the scratch.", www.habrahabr.ru, (Russian)