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2. Weinstein, V.S., Grigoryan, A.A.: The input device of graphics information into a computer. Automatic Reading of the Text. VINITI (1967). (in Russian)
3. Text Recognition. Available from: http://mrtranslate.ru/download/textrecognition.html . Accessed 20 June 2016
4. ABBYY Fine Reader Engine 8.1 for Windows. Available from: http://www.interface.ru/home.asp?artId=6911 . Accessed 1 July 2017 (in Russian)
5. Lisin, S.: OCR-systems. Available from: http://old.ci.ru/inform16_02/p_22text.htm . Accessed 1 July 2017 (in Russian)