1. WIPO Economics & Statistics Series, World Intellectual Property Indicators, http://www.wipo.int/export/sites/www/freepublications/en/intproperty/941/wipo_pub_941_2013.pdf
2. Dykov, M.A., Kravets, A.G., Korobkin, D.M., Ukustov, S.S., Strelkov, O.I.: Presentation of the document as a key phrases vector to solve the problem of prior-art retrieval in the patent descriptions. Caspian Journal: Management and High Technologies 1, 148–154 (2014) (in Russian)
3. CCIS;S. Fomenkov,2014
4. PostgreSQL 8.4.22 Documentation, http://www.postgresql.org/docs/8.4/static/index.html
5. Dykov, M.A., Kravets, A.G., Korobkin, D.M., Ukustov, S.S., Strelkov, O.I.: Combining statistical and semantic features for patents prior-art retrieval. In: Proceedings of the 3rd Int. Scientific-Practical Conference Innovation Information Technologies, Praque, April 21-25, vol. 2, pp. 609–616 (2014)