1. Dzenopoljac, V., Muhammed, Sh., Janosevic, S.: Intangibles and performance in oil and gas industry. Management Decision (2018). https://doi.org/10.1108/MD-11-2017-1139. Accessed 18 May 2019
2. Sveiby, K.E.: Knowledge companies (1986). http://www.sveiby.com/Portals/0/books/knowledgecompanies.html. Accessed 20 May 2018
3. Stewart, T.A.: Intellectual Capital: The New Wealth of Organizations, p. 125. Doubleday/Currency, New York (1997)
4. Edvinsson, L., Malone, M.S.: Intellectual Capital: The Proven Way to Establish Your Company’s Real Value by Measuring its Hidden Brainpower, p. 430. Platkus, London (1997)
5. Reilly, R., Schweiss, R.: Otsenka nematerial’nykh aktivov [Valuation of intangible assets.]. Quinto Consulting, 796 p. (1998, 2005). (in Russian)